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Amaya, Veronica, Mandy B. A. Paterson, Kris Descovich et Clive J. C. Phillips. « Effects of Olfactory and Auditory Enrichment on Heart Rate Variability in Shelter Dogs ». Animals 10, no 8 (10 août 2020) : 1385. http://dx.doi.org/10.3390/ani10081385.
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Animal shelters can be stressful environments and time in care may affect individual dogs in negative ways, so it is important to try to reduce stress and arousal levels to improve welfare and chance of adoption. A key element of the stress response is the activation of the autonomic nervous system (ANS), and a non-invasive tool to measure this activity is heart rate variability (HRV). Physiologically, stress and arousal result in the production of corticosteroids, increased heart rate and decreased HRV. Environmental enrichment can help to reduce arousal related behaviours in dogs and this study focused on sensory environmental enrichment using olfactory and auditory stimuli with shelter dogs. The aim was to determine if these stimuli have a physiological effect on dogs and if this could be detected through HRV. Sixty dogs were allocated to one of three stimuli groups: lavender, dog appeasing pheromone and music or a control group, and usable heart rate variability data were obtained from 34 dogs. Stimuli were applied for 3 h a day on five consecutive days, with HRV recorded for 4 h (treatment period + 1 h post-treatment) on the 5th and last day of exposure to the stimuli by a Polar® heart rate monitor attached to the dog’s chest. HRV results suggest that music activates both branches of the ANS, which may be useful to relieve both the stress and boredom in shelter environments.
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Amaya, Veronica, Mandy B. A. Paterson et Clive J. C. Phillips. « Effects of Olfactory and Auditory Enrichment on the Behaviour of Shelter Dogs ». Animals 10, no 4 (30 mars 2020) : 581. http://dx.doi.org/10.3390/ani10040581.
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Shelter environments are stressful for dogs, as they must cope with many stimuli over which they have little control. This can lead to behavioural changes, negatively affect their welfare and downgrade the human‐animal bond, affecting re-homing success. Arousal is evident in their behaviour, particularly increased activity and frequent vocalisation. Environmental enrichment plays an important role in reducing arousal behaviour, either through direct physiological effects or by masking stressful stimuli. The present study focused on sensory environmental enrichment, using olfactory and auditory stimuli under shelter conditions. Sixty dogs were allocated to one of four treatments: three types of enrichment, Lavender, Dog appeasing pheromone (DAP) and Music, and a Control group. Stimuli were applied for 3 h/d on five consecutive days. Dogs exposed to DAP lay down more, and those exposed to Music lay down more with their head down, compared to the Control. Those in the Control stood more on their hind legs with their front legs on the exit door, compared to those exposed to Music and DAP, particularly if they had only been in the shelter for a short time. They also panted and vocalised much more than dogs in the three enrichment treatments, which tended to persist during the 4 h period post treatment, and in the case of vocalisation into the subsequent night. The study suggests that all three enrichments had some positive benefits for dogs in shelters, as well as being non-invasive and easy to apply in the shelter environment.
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Villela, Mariana Silva, et Vera Helena Moro Bins Ely. « Stimuli towards well-being in an environment with Complementary and Integrative Practices (CIPs) ». Ambiente Construído 20, no 2 (juin 2020) : 441–56. http://dx.doi.org/10.1590/s1678-86212020000200408.
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Abstract This article presents a proposal to categorise stimuli that influence well-being in therapeutic environments following Complementary and Integrative Practices (CIPs). With the broader aim of understanding which environmental stimuli influence the well-being of CIP therapeutic environment users, this qualitative research adopted a multimethod approach: bibliographic and documentary research; walkthrough analysis; exploratory visits; environment observations; and finally, interviews. After cross-referencing a literature review and an environmental assessment of three case studies during 2017, a categorisation was drawn up, and it suggests that the stimuli which most influence well-being in CIP environments are: Artistic, Auditory, Biological, Luminous and Hygrothermal Comfort, Energetic, Spatial, Natural, Olfactory, Social and Socio-Spatial stimuli. Included in a broader debate on creating environments favourable to users’ health, and in line with an increasing demand of CIPs in Brazil, this categorisation aims at contributing to the knowledge of CIP environment-specific necessities and improving the quality from the early stage of project idealisation.
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Carcaud, Julie, Thomas Hill, Martin Giurfa et Jean-Christophe Sandoz. « Differential coding by two olfactory subsystems in the honeybee brain ». Journal of Neurophysiology 108, no 4 (15 août 2012) : 1106–21. http://dx.doi.org/10.1152/jn.01034.2011.
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Sensory systems use parallel processing to extract and process different features of environmental stimuli. Parallel processing has been studied in the auditory, visual, and somatosensory systems, but equivalent research in the olfactory modality is scarce. The honeybee Apis mellifera is an interesting model for such research as its relatively simple brain contains a dual olfactory system, with a clear neural dichotomy from the periphery to higher-order centers, based on two main neuronal tracts [medial (m) and lateral (l) antenno-protocerebral tract (APT)]. The function of this dual system is as yet unknown, and attributes like odor quality and odor quantity might be separately encoded in these subsystems. We have thus studied olfactory coding at the input of both subsystems, using in vivo calcium imaging. As one of the subsystems (m-APT) has never been imaged before, a novel imaging preparation was developed to this end, and responses to a panel of aliphatic odorants at different concentrations were compared in both subsystems. Our data show a global redundancy of olfactory coding at the input of both subsystems but unravel some specificities for encoding chemical group and carbon chain length of odor molecules.
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Satow, Aiko. « An Ecological Approach to Mechanisms Determining Individual Differences in Perception ». Perceptual and Motor Skills 62, no 3 (juin 1986) : 983–98. http://dx.doi.org/10.2466/pms.1986.62.3.983.
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In 1982 Satow proposed four hypothetical properties determining mechanisms of individual differences in perceptions; these were supported by results of a factor analysis of responses to a 58-item check list. Present work confirmed the four properties (intense sensitivity, temporal sensitivity, sensory-motor reactivity, and possible range of total stimuli), and obtained a property, preference for intense and prolonged stimuli, from a principal component analysis of data from a 60-item list given to 316 subjects. The 60-item list is a revised version of the 58-item list which asked subjects about their subjective sensitiveness and preferences for environmental sensory stimuli (visual, auditory, olfactory, and tactile). Within subjects relationships among these properties are interindependent, since for individuals correlations of factor-score estimates between pairs of these properties were near zero. This interindependence supported a model of four hypothetical types of individuals, explaining the individual differences on the grounds of the relations among the properties.
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Brasić, James Robert. « Hallucinations ». Perceptual and Motor Skills 86, no 3 (juin 1998) : 851–77. http://dx.doi.org/10.2466/pms.1998.86.3.851.
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Hallucinations, sensory perceptions without environmental stimuli, occur as simple experiences of auditory, gustatory, olfactory, tactile, or visual phenomena as well as mixed or complex experiences of more than one simple phenomenon. The nature of the hallucination assists localization, differential diagnosis, and treatment planning. In particular, the presence of persistent visual hallucinations of persons with Parkinson's disease predicts dementia, rapid deterioration, permanent nursing home placement, and death. Hallucinations in persons with Alzheimer's disease are often associated with serious behavioral problems and predict a rapid cognitive decline. Theories of the etiology of hallucinations include (1) stimulation, e.g., neurochemical, electrical, seizure, and ephaptic, and (2) inhibition, e.g., destruction of normally inhibitory functions, resulting in disinhibition as in the Charles Bonnet and phantom limb syndromes. Functional neuroimaging procedures suggest anatomical associations for hallucinations. While hallucinations may be a symptom of medical, neurologic, and psychiatric disorders, they may also occur in a wide range of human experiences.
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Kang, Hyoyoung, et Youngran Chae. « Effects of Integrated Indirect Forest Experience on Emotion, Fatigue, Stress, and Immune Function in Hemodialysis Patients ». International Journal of Environmental Research and Public Health 18, no 4 (10 février 2021) : 1701. http://dx.doi.org/10.3390/ijerph18041701.
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Background: Most hemodialysis patients may experience physiological and psychological stress. Exposure to nature has been reported to reduce psychological and physiological stress levels and improve immune function. This study aimed to investigate psychological and physiological effects of integrated indirect forest experience on chronic renal failure patients undergoing hemodialysis. Methods: As a quasi-experiment, this study employed a nonequivalent control group, repeated measurements, and a non-synchronized design. In total, 54 participants were included: 26 and 28 patients in the experimental and control groups, respectively. During hemodialysis, five types of forest therapy stimuli (visual, auditory, olfactory, tactile, and motor) were applied 3 times per week for 4 weeks during 15 min sessions. Results: Positive, but not negative, emotion measures differed between the groups after the intervention. Fatigue and physiological stress levels were significantly reduced in the experimental group, whereas no significant difference was found between the groups with respect to measures of psychological stress. Activation of both the parasympathetic and sympathetic nervous systems was similar in both groups, as was the number of natural killer cells. Conclusion: Integrated indirect forest experience may help increase positive emotions and reduce fatigue and stress levels during hemodialysis in patients with chronic renal failure.
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Thaploo, Divesh, Stefanie Zelder et Thomas Hummel. « Olfactory Modulation of the Contingent Negative Variation to Auditory Stimuli ». Neuroscience 470 (août 2021) : 16–22. http://dx.doi.org/10.1016/j.neuroscience.2021.07.005.
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Christensen, Janne Winther, Linda Jane Keeling et Birte Lindstrøm Nielsen. « Responses of horses to novel visual, olfactory and auditory stimuli ». Applied Animal Behaviour Science 93, no 1-2 (septembre 2005) : 53–65. http://dx.doi.org/10.1016/j.applanim.2005.06.017.
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Parfet, K. A., et H. W. Gonyou. « Attraction of newborn piglets to auditory, visual, olfactory and tactile stimuli. » Journal of Animal Science 69, no 1 (1991) : 125. http://dx.doi.org/10.2527/1991.691125x.
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Hörberg, Thomas, Maria Larsson, Ingrid Ekström, Camilla Sandöy, Peter Lundén et Jonas K. Olofsson. « Olfactory Influences on Visual Categorization : Behavioral and ERP Evidence ». Cerebral Cortex 30, no 7 (30 mars 2020) : 4220–37. http://dx.doi.org/10.1093/cercor/bhaa050.
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Abstract Visual stimuli often dominate nonvisual stimuli during multisensory perception. Evidence suggests higher cognitive processes prioritize visual over nonvisual stimuli during divided attention. Visual stimuli should thus be disproportionally distracting when processing incongruent cross-sensory stimulus pairs. We tested this assumption by comparing visual processing with olfaction, a “primitive” sensory channel that detects potentially hazardous chemicals by alerting attention. Behavioral and event-related brain potentials (ERPs) were assessed in a bimodal object categorization task with congruent or incongruent odor–picture pairings and a delayed auditory target that indicated whether olfactory or visual cues should be categorized. For congruent pairings, accuracy was higher for visual compared to olfactory decisions. However, for incongruent pairings, reaction times (RTs) were faster for olfactory decisions. Behavioral results suggested that incongruent odors interfered more with visual decisions, thereby providing evidence for an “olfactory dominance” effect. Categorization of incongruent pairings engendered a late “slow wave” ERP effect. Importantly, this effect had a later amplitude peak and longer latency during visual decisions, likely reflecting additional categorization effort for visual stimuli in the presence of incongruent odors. In sum, contrary to what might be inferred from theories of “visual dominance,” incongruent odors may in fact uniquely attract mental processing resources during perceptual incongruence.
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Speed, Laura J., Ilja Croijmans, Sarah Dolscheid et Asifa Majid. « Crossmodal Associations with Olfactory, Auditory, and Tactile Stimuli in Children and Adults ». i-Perception 12, no 6 (novembre 2021) : 204166952110485. http://dx.doi.org/10.1177/20416695211048513.
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People associate information with different senses but the mechanism by which this happens is unclear. Such associations are thought to arise from innate structural associations in the brain, statistical associations in the environment, via shared affective content, or through language. A developmental perspective on crossmodal associations can help determine which explanations are more likely for specific associations. Certain associations with pitch (e.g., pitch–height) have been observed early in infancy, but others may only occur late into childhood (e.g., pitch–size). In contrast, tactile–chroma associations have been observed in children, but not adults. One modality that has received little attention developmentally is olfaction. In the present investigation, we explored crossmodal associations from sound, tactile stimuli, and odor to a range of stimuli by testing a broad range of participants. Across the three modalities, we found little evidence for crossmodal associations in young children. This suggests an account based on innate structures is unlikely. Instead, the number and strength of associations increased over the lifespan. This suggests that experience plays a crucial role in crossmodal associations from sound, touch, and smell to other senses.
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Hutson, G. D., L. G. Dickenson, J. L. Wilkinson et B. G. Luxford. « The response of sows to novel visual, olfactory, auditory and tactile stimuli ». Applied Animal Behaviour Science 35, no 3 (janvier 1993) : 255–66. http://dx.doi.org/10.1016/0168-1591(93)90141-b.
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Leclerc, Marcel P., Thilo Kellermann, Jessica Freiherr, Benjamin Clemens, Ute Habel et Christina Regenbogen. « Externalization Errors of Olfactory Source Monitoring in Healthy Controls—An fMRI Study ». Chemical Senses 44, no 8 (15 août 2019) : 593–606. http://dx.doi.org/10.1093/chemse/bjz055.
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Abstract Using a combined approach of functional magnetic resonance imaging (fMRI) and noninvasive brain stimulation (transcranial direct current stimulation [tDCS]), the present study investigated source memory and its link to mental imagery in the olfactory domain, as well as in the auditory domain. Source memory refers to the knowledge of the origin of mental experiences, differentiating events that have occurred and memories of imagined events. Because of a confusion between internally generated and externally perceived information, patients that are prone to hallucinations show decreased source memory accuracy; also, vivid mental imagery can lead to similar results in healthy controls. We tested source memory following cathodal tDCS stimulation using a mental imagery task, which required participants to perceive or imagine a set of the same olfactory and auditory stimuli during fMRI. The supplementary motor area (SMA) is involved in mental imagery across different modalities and potentially linked to source memory. Therefore, we attempted to modulate participants’ SMA activation before entering the scanner using tDCS to influence source memory accuracy in healthy participants. Our results showed the same source memory accuracy between the olfactory and auditory modalities with no effects of stimulation. Finally, we found SMA’s subregions differentially involved in olfactory and auditory imagery, with activation of dorsal SMA correlated with auditory source memory.
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Herz, R. S. « A Naturalistic Analysis of Autobiographical Memories Triggered by Olfactory Visual and Auditory Stimuli ». Chemical Senses 29, no 3 (1 mars 2004) : 217–24. http://dx.doi.org/10.1093/chemse/bjh025.
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Schebella, Morgan Faith, Delene Weber, Lisa Schultz et Philip Weinstein. « The Nature of Reality : Human Stress Recovery during Exposure to Biodiverse, Multisensory Virtual Environments ». International Journal of Environmental Research and Public Health 17, no 1 (19 décembre 2019) : 56. http://dx.doi.org/10.3390/ijerph17010056.
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Immersive virtual environments (IVEs) were used to test the effects of biodiversity on recovery from induced stress. Three natural environments and one urban environment were used to represent ordinal levels of biodiversity (none, low, moderate, and high). The four IVEs comprised visual, auditory, and olfactory stimuli. An additional high biodiversity IVE without auditory or olfactory stimuli was also included to study the effects of multisensory stimulation per se on recovery from stress and perceptions of biodiversity. Following stress induction via a novel IVE Trier Social Stress Test (TSST-IVE), heart rate and five self-reported well-being measures were used to assess participants’ recovery after immersion in one of the five IVEs. The results showed consistent well-being responses across both self-reported and physiological measures, suggesting biodiversity does directly affect human well-being. However, the relationship was not linear. For most measures of well-being, stress recovery was least effective in the urban IVE, consistent with past research. The low biodiversity IVE elicited the greatest improvement in all well-being measures except self-reported calmness. One could speculate that the landscape features of the least biodiverse IVE may elicit subconscious preferences toward savanna-like landscapes, as suggested by previous studies. The IVE depicting a moderate level of biodiversity was the least restorative of the natural environments. A multisensory experience was associated with better recovery in all measures of well-being than a visual-only experience, and perceptions of landscape components significantly differed between two identical nature scenes when auditory and olfactory stimuli were removed. Nuances in the data and implications of the findings are discussed. The results signal a need for caution and question the assumption that cultural ecosystem services align with positive outcomes for biodiversity conservation.
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Baillon, Sarah, Erik van Diepen et Richard Prettyman. « Multi-sensory therapy in psychiatric care ». Advances in Psychiatric Treatment 8, no 6 (novembre 2002) : 444–50. http://dx.doi.org/10.1192/apt.8.6.444.
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Multi-sensory therapy is an activity which usually takes place in a dedicated room where patients experience a range of unpatterned visual, auditory, olfactory and tactile stimuli (Baker et al, 1997). These rooms are designed to create a feeling of comfort and safety, where the individual can relax, explore and enjoy the surroundings (Fig 1.).
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TANAKA, Toshio, Naohiko OCHIAI, Hajime TANIDA et Tadashi YOSHIMOTO. « The Role of Visual, Auditory, and Olfactory Stimuli in Teat Seeking Behavior of Piglets ». Nihon Chikusan Gakkaiho 69, no 9 (1998) : 854–60. http://dx.doi.org/10.2508/chikusan.69.854.
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Pearce, G. P., et P. E. Hughes. « The influence of boar-component stimuli on puberty attainment in the gilt ». Animal Science 44, no 2 (avril 1987) : 293–302. http://dx.doi.org/10.1017/s0003356100018663.
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ABSTRACTTwo experiments employing 72 and 48 pre-pubertal Large White ♂ × (Large White ♂ × Landrace ♀) gilts respectively were carried out to investigate the involvement of various boar stimuli in the induction of precocious puberty in the gilt. Experiment 1 consisted of the following treatments commencing at 165 days of age: (1) contact with an androgenized, castrated male; (2) contact with an androgenized castrated male plus a recording of boar chants; (3) as treatment (2) plus exposure to a solution of 16-androstene steroids, 3α-androstenol (5α-androst-16-en-3α-ol) and 5α-androstenone (5α-androst-16-en-3-one); and (4) contact with an entire boar. In experiment 2, additional exposure to boar urine occurred in treatments (2) and (3).Exposure of gilts to tactile, visual and auditory cues from the boar had little effect on puberty attainment. The additional exposure to 16-androstene steroids did stimulate puberty but was not as efficacious as boar exposure. Additional exposure to boar urine improved the puberty-stimulating effect of the castrated males, and further additional exposure to 16-androstenes produced a response approaching that obtained by boar exposure.These results confirm the involvement of olfactory cues from the boar in stimulating puberty in the gilt. The olfactory cues appear to be 16-androstene steroids present in boar saliva and some undefined compound(s) present in boar urine. These experiments suggest that olfactory stimuli from the boar require the simultaneous exposure to tactile and possibly also visual and auditory cues from the boar in order to stimulate the onset of puberty in the gilt.cues from the mature boar are also involved in mediating the stimulation of puberty. Exposure of gilts to isolated sources of androstene pheromones was ineffective in stimulating puberty (Kirkwood et al., 1983), whereas exposure to contact with a sialectomized boar order to stimulate the onset of puberty in the gilt.
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Kartop, Remziye, et Özlem Ekizoğlu. « The Effect of Sensory Marketing on the Purchase Behavior of Sports Wear Products ». Journal of Educational Issues 8, no 2 (4 octobre 2022) : 445. http://dx.doi.org/10.5296/jei.v8i2.20153.
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Intense competition conditions push businesses and brands to differentiate. One of the ways brands differentiate themselves from their competitors is to carry out interesting marketing activities for consumers. In this sense, sense-oriented marketing strategies can be used to activate the purchasing behavior of consumers. This research aims to reveal how consumers are affected by sensory marketing elements when purchasing sports ready-to-wear products and their differences according to demographic characteristics. Tekin (2021) used the scale of “the effect of sensory marketing on the buying behavior of ready-made clothing”, which he used in his graduate study. The sample group consists of 241 female and 259 male participants who volunteered and visited the sports shops of 6 shopping centers in Istanbul. In the analysis of the data, Multiple Frequency, Mann-Whitney U test and Kruskal Wallis analyzes were applied.It is seen that men, participants with university education, 34-41 age group and 2501-4000 TL monthly income spend more in the consumption of sports textile products. The participants stated that they purchase 10% or less of their monthly budget for sports products, they mostly buy from the physical store, they prefer classical music in the store, they show more demand for light colored products, and the majority prefer the Adidas brand. The effect of visual, olfactory and tactile stimuli in the store atmosphere on the consumption of sports textile products, on gender and education; visuality of brand and store design on gender, education and monthly income; It has been determined that olfactory and auditory stimuli show significant differences according to education and monthly income. It is seen that the effect of product visualization and the effect of olfactory, auditory and tactile stimuli do not change according to any personal characteristics.
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Sung-Hyun Kim, Seung-Hyun Kwak, ByungChan Min, Young-Jung Kim, 김진수, Seo, Sang Hyeok et Young-Jae Ryu. « The Effect of Olfactory Fragrance Stimulation on Stress Reduction According to Auditory Stimuli by Frequency ». Journal of Knowledge Information Technology and Systems 12, no 1 (février 2017) : 13–22. http://dx.doi.org/10.34163/jkits.2017.12.1.002.
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Gentsch, Kornelia, Ursula Beermann, Lingdan Wu, Stéphanie Trznadel et Klaus R. Scherer. « Temporal Unfolding of Micro-valences in Facial Expression Evoked by Visual, Auditory, and Olfactory Stimuli ». Affective Science 1, no 4 (13 novembre 2020) : 208–24. http://dx.doi.org/10.1007/s42761-020-00020-y.
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AbstractAppraisal theories suggest that valence appraisal should be differentiated into micro-valences, such as intrinsic pleasantness and goal-/need-related appraisals. In contrast to a macro-valence approach, this dissociation explains, among other things, the emergence of mixed or blended emotions. Here, we extend earlier research that showed that these valence types can be empirically dissociated. We examine the timing and the response patterns of these two micro-valences via measuring facial muscle activity changes (electromyography, EMG) over the brow and the cheek regions. In addition, we explore the effects of the sensory stimulus modality (vision, audition, and olfaction) on these patterns. The two micro-valences were manipulated in a social judgment task: first, intrinsic un/pleasantness (IP) was manipulated by exposing participants to appropriate stimuli presented in different sensory domains followed by a goal conduciveness/obstruction (GC) manipulation consisting of feedback on participants’ judgments that were congruent or incongruent with their task-related goal. The results show significantly different EMG responses and timing patterns for both types of micro-valence, confirming the prediction that they are independent, consecutive parts of the appraisal process. Moreover, the lack of interaction effects with the sensory stimulus modality suggests high generalizability of the underlying appraisal mechanisms across different perception channels.
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Roll, John M. « The effect of olfactory and auditory stimuli on drinking suppressed with a conditioned taste aversion ». Behavioural Processes 37, no 1 (août 1996) : 31–38. http://dx.doi.org/10.1016/0376-6357(95)00069-0.
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Zucco, Gesualdo M. « Anomalies in Cognition : Olfactory Memory ». European Psychologist 8, no 2 (janvier 2003) : 77–86. http://dx.doi.org/10.1027//1016-9040.8.2.77.
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The two experiments presented in this paper examine the effects of strategies and interference tasks on odor recognition. In the first experiment (an extension of Lyman and McDaniel's study from 1986 ), participants were asked to smell 30 odors and to perform different elaborative tasks for each of them such as: (1) providing a name or a short definition; (2) creating an image; (3) describing a specific life episode; (4) simply smelling the odors. Results showed no effect of encoding tasks on the correct recognition of odors. In the second experiment, participants were exposed to either 15 olfactory stimuli, 15 visual stimuli (photographs of human faces), or 15 acoustic stimuli (environmental sounds). In the four sessions of the experiment, they had to recognize the stimuli whether in a no-interference condition, or in an intramodality, or in two intermodalities interfering conditions. Consistently with the literature, interference affects recognition for visual and acoustic material but has no effect on odor recognition. The results of both experiments and some other anomalies in olfactory memory are discussed and tentatively integrated into a single model. The main assumption is that memory for odors represents a unique and separate memory system.
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Haas, Ellen C. « Auditory Perception ». Proceedings of the Human Factors Society Annual Meeting 36, no 3 (octobre 1992) : 247. http://dx.doi.org/10.1518/107118192786751817.
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Auditory perception involves the human listener's awareness or apprehension of auditory stimuli in the environment. Auditory stimuli, which include speech communications as well as non-speech signals, occur in the presence and absence of environmental noise. Non-speech auditory signals range from simple pure tones to complex signals found in three-dimensional auditory displays. Special hearing protection device (HPD) designs, as well as additions to conventional protectors, have been developed to improve speech communication and auditory perception capabilities of those exposed to noise. The thoughtful design of auditory stimuli and the proper design, selection, and use of HPDs within the environment can improve human performance and reduce accidents. The purpose of this symposium will be to discuss issues in auditory perception and to describe methods to improve the perception of auditory stimuli in environments with and without noise. The issues of interest include the perception of non-speech auditory signals and the improvement of auditory perception capabilities of persons exposed to noise. The first three papers of this symposium describe the perception of non-speech auditory signals. Ellen Haas defines the extent to which certain signal elements affect the perceived urgency of auditory warning signals. Michael D. Good and Dr. Robert H. Gilkey investigate free-field masking as a function of the spatial separation between signal and masker sounds within the horizontal and median planes. Jeffrey M. Gerth explores the discrimination of complex auditory signal components that differ by sound category, temporal pattern, density, and component manipulation. The fourth paper of this symposium focuses upon the improvement of auditory perception capabilities of persons exposed to hazardous noise, and who must wear hearing protection. Special HPD designs, as well as additions to conventional protectors, have been developed to improve speech communication and auditory perception capabilities of persons exposed to noise. Dr. John G. Casali reviews several new HPD technologies and describes construction features, empirical performance data, and applications of each device. These papers illustrate current research issues in the perception of auditory signals. The issues are all relevant to the human factors engineering of auditory signals and personal protective gear. The perception of auditory stimuli can be improved by the thoughtful human factors design of auditory stimuli and by the proper use of HPDs.
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Fukuzawa, Megumi, et Shihori Kajino. « Auditory Stimuli as Environmental Enrichment Tool for Family Dogs ». International Journal of Biology 10, no 3 (27 avril 2018) : 19. http://dx.doi.org/10.5539/ijb.v10n3p19.
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Ten healthy pet dogs with an average maximum resting heart rate of 92 bpm that had never been used in studies of auditory stimulation were exposed randomly to one of three sound conditions on each of three occasions within a 5-day period. Posture and behaviour were recorded continuously by video for a total of 20 min over three phases: 5 min before sound exposure, 10 min during sound exposure, and 5 min after sound exposure. Each dog wore a Polar HR monitor throughout testing, and heart rate was recorded by using R–R interval data. Maximum heart rate was significantly greater during heartbeat sound exposure than afterwards, and average heart rate with both heartbeat sound and classical sound showed decrease tendencies.The time spent in dynamic (e.g. movement-related) postures was significantly higher before treatment than during or after under all three conditions. These data suggest that auditory stimuli in dogs may affect physiological responses without necessarily affecting behaviour, and specifically that heart rate may be elevated by auditory exposure to a faster heartbeat.
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Bergerbest, Dafna, Dara G. Ghahremani et John D. E. Gabrieli. « Neural Correlates of Auditory Repetition Priming : Reduced fMRI Activation in the Auditory Cortex ». Journal of Cognitive Neuroscience 16, no 6 (juillet 2004) : 966–77. http://dx.doi.org/10.1162/0898929041502760.
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Repetition priming refers to enhanced or biased performance with repeatedly presented stimuli. Modality-specific perceptual repetition priming has been demonstrated behaviorally for both visually and auditorily presented stimuli. In functional neuroimaging studies, repetition of visual stimuli has resulted in reduced activation in the visual cortex, as well as in multimodal frontal and temporal regions. The reductions in sensory cortices are thought to reflect plasticity in modality-specific neocortex. Unexpectedly, repetition of auditory stimuli has resulted in reduced activation in multimodal and visual regions, but not in the auditory temporal lobe cortex. This finding puts the coupling of perceptual priming and modality-specific cortical plasticity into question. Here, functional magnetic resonance imaging was used with environmental sounds to reexamine whether auditory priming is associated with reduced activation in the auditory cortex. Participants heard environmental sounds (e.g., animals, machines, musical instruments, etc.) in blocks, alternating between initial and repeated presentations, and decided whether or not each sound was produced by an animal. Repeated versus initial presentations of sounds resulted in repetition priming (faster responses) and reduced activation in the right superior temporal gyrus, bilateral superior temporal sulci, and right inferior prefrontal cortex. The magnitude of behavioral priming correlated positively with reduced activation in these regions. This indicates that priming for environmental sounds is associated with modification of neural activation in modality-specific auditory cortex, as well as in multimodal areas.
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Woo, Hee-Soon, et Chiang-Soon Song. « Comparison of Hand Dexterity According to Selected Thermal and Auditory Stimuli ». International Journal of Environmental Research and Public Health 20, no 1 (31 décembre 2022) : 765. http://dx.doi.org/10.3390/ijerph20010765.
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The hand plays a crucial role in our daily lives and affects the quality of life. Sensory stimuli can affect the activation of the autonomic nervous system to control body homeostasis and finger motions. This study aimed to determine the optimal thermal and auditory stimuli that affect hand dexterity. The experiment included thirty healthy adults. In the experiment, the thermal stimuli were classified into 20, 30, and 40 °C. The auditory stimuli were classified into fast- and slow-tempo music. Each stimulus was randomly provided for 5 min and hand dexterity was tested with the Groove and Purdue pegboard tests. After each stimulus and test was conducted, a resting time of 20 min was provided before the next stimulus. When the thermal stimulus of 30 °C and auditory stimulus of fast-tempo music was provided, the completion duration of the hand dexterity test was the shortest. Except the thermal stimulus of 20 °C, all thermal and auditory stimuli induced increased hand dexterity, compared to the non-stimulated condition. Among the five categories of thermal and auditory stimuli, the thermal stimulus of 30 °C and auditory stimulus of fast-tempo music were the most effective in improving hand dexterity.
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Royet, Jean-P., David Zald, Rémy Versace, Nicolas Costes, Frank Lavenne, Olivier Koenig et Rémi Gervais. « Emotional Responses to Pleasant and Unpleasant Olfactory, Visual, and Auditory Stimuli : a Positron Emission Tomography Study ». Journal of Neuroscience 20, no 20 (15 octobre 2000) : 7752–59. http://dx.doi.org/10.1523/jneurosci.20-20-07752.2000.
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Vigil, Jacob M., Daniel Torres, Alexander Wolff et Katy Hughes. « Exposure to Virtual Social Stimuli Modulates Subjective Pain Reports ». Pain Research and Management 19, no 4 (2014) : e103-e108. http://dx.doi.org/10.1155/2014/815056.
Texte intégralRésumé :
BACKGROUND: Contextual factors, including the gender of researchers, influence experimental and patient pain reports. It is currently not known how social stimuli influence pain percepts, nor which types of sensory modalities of communication, such as auditory, visual or olfactory cues associated with person perception and gender processing, produce these effects.OBJECTIVES: To determine whether exposure to two forms of social stimuli (audio and visual) from a virtual male or female stranger modulates cold pressor task (CPT) pain reports.METHODS: Participants with similar demographic characteristics conducted a CPT in solitude, without the physical presence of an experimenter or another person. During the CPT, participants were exposed to the voice and image of a virtual male or female stranger. The voices had analogous vocal prosody, provided no semantic information (spoken in a foreign language) and differed only in pitch; the images depicted a middle-age male or female health care practitioner.RESULTS: Male participants, but not females, showed higher CPT pain intensity when they were exposed to the female stimuli compared with the male stimuli. Follow-up analyses showed that the association between the social stimuli and variability in pain sensitivity was not moderated by individual differences in subjective (eg, self-image) or objective measurements of one’s physical stature.DISCUSSION: The findings show that exposure to virtual, gender-based auditory and visual social stimuli influences exogenous pain sensitivity.CONCLUSION: Further research on how contextual factors, such as the vocal properties of health care examiners and exposure to background voices, may influence momentary pain perception is necessary for creating more standardized methods for measuring patient pain reports in clinical settings.
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Renda, S., et A. le Roux. « The sensory ecology of prey detection in the bat-eared fox (Otocyon megalotis) ». Behaviour 154, no 2 (2017) : 227–40. http://dx.doi.org/10.1163/1568539x-00003419.
Texte intégralRésumé :
In the absence of direct sunlight, nocturnal animals face sensory challenges different to those affecting their diurnal counterparts whilst foraging. Anecdotal observations have led to the general prediction that the auditory sensory mode is the most prominent for the bat-eared fox (Otocyon megalotis), a nocturnal, insectivorous canid. The present study aimed to clarify the relative importance of different sensory modes to foraging bat-eared foxes by conducting sensory trials with individuals belonging to a habituated population in the Kuruman River Reserve in South Africa. Foxes were tested in repeated trials controlling for particular sensory stimuli using live or pre-killed prey. Auditory cues proved significant () predictors of fox foraging success with olfactory and visual cues indicated as being of secondary importance. This study thus provides empirical confirmation for anecdotal reports that the bat-eared fox is predominantly reliant on auditory cues to determine hunting success.
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Barrie, J. M., W. J. Freeman et M. D. Lenhart. « Spatiotemporal analysis of prepyriform, visual, auditory, and somesthetic surface EEGs in trained rabbits ». Journal of Neurophysiology 76, no 1 (1 juillet 1996) : 520–39. http://dx.doi.org/10.1152/jn.1996.76.1.520.
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1. Spatial ensemble averages were computed for 64 traces of electroencephalograms (EEGs) simultaneously recorded from 8 x 8 arrays over the epidural surfaces of the prepyriform cortex (PPC) and visual, somatic, and auditory cortices. They revealed a common waveform across each array. Examination of the spatial amplitude modulation (AM) of the waveform revealed classifiable spatial pattern in short time segments. The AM patterns varied within trials after presentation of identical conditioned stimuli, and also between trials with differing stimuli. 2. PPC EEGs revealed strong correlates with the respiratory rhythm; neocortical EEGs did not. 3. Time ensemble averaging of the PPC EEG attenuated the oscillatory bursts, indicating that olfactory gamma oscillations (20-80 Hz) were not phase-locked to the times of stimulus delivery but instead to inhalations. Time ensemble averages of neocortical recordings across trials revealed average evoked potentials starting 30-50 ms after the arrival of the stimulus. 4. Average temporal fast Fourier transform (FFT) power spectral densities (PSDs) from pre- and poststimulus PPC EEG segments revealed a peak of gamma activity in olfactory bursts. 5. The logarithm of the average temporal FFT PSDs from pre- and poststimulus neocortical EEG segments, when plotted against log frequency, revealed 1/f-type spectra in both pre- and poststimulus segments for negative/aversive conditioned stimuli (CS-) and positive/rewarding conditioned stimuli (CS+). The alpha'- and beta'-coefficients from the regression of Eq. 2 onto the average PSDs were significantly different between pre- and poststimulus segments, owing to the evoked potentials, but not between CS- and CS+ stimulus segments. 6. Spatiotemporal patterns were invariant over all frequency bins in the 1/f domain (20-100 Hz). Spatiotemporal patterns in the 2- to 20-Hz domain progressively differed from the invariant patterns with decreasing frequency. 7. In the spatial frequency domain, the logarithm of the average spatial FFT power spectra from pre- and poststimulus neocortical EEG segments, when plotted against the log spatial frequency, fell monotonically from the maximum at the lowest spatial frequency, downwardly curving to a linear 1/f spectral domain. This curve in the 1/f spectral domain extended from 0.133 to 0.880 cycles/mm in the PPC and from 0.095 to 0.624 cycles/mm in the neocortices. 8. Methods of FFT and principal component analysis (PCA) EEG decomposition were used to extract the broad-spectrum waveform common to all 64 EEGs from an array. AM patterns for the FFT and PCA components were derived by regression. They were shown by cross-correlation to yield spatial patterns that were equivalent to each other and to AM patterns from calculation of the 64 root-mean-square amplitudes of the segments. 9. Each spatial AM pattern was expressed by a 1 x 64 column vector and a point in 64-space. Similar patterns formed clusters, and dissimilar patterns gave multiple clusters. A statistical test was devised to evaluate dissimilarity by a Euclidean distance metric in 64-space. 10. Significant spatial pattern classification of CS- versus CS+ trials (below the 1% confidence limit for 20 of each) was found in discrete temporal segments of poststimulus data after digital temporal and spatial filter optimization. 11. Varying the analysis window duration from 10 to 500 ms yielded a window length of 120 ms as optimal for pattern classification. A 120-ms window was subsequently stepped across each record in overlapping intervals of 20 ms. Windows in which episodic, significant CS+/CS- differences occurred lasted 50-200 ms and were separated by 100-200 ms in the poststimulus period. 12. Neocortical spatial patterns changed under reinforcement contingency reversal, showing a lack of invariance in respect to stimuli and a dependence on context and learning, as previously found for the olfactory bulb and PPC.
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Lancioni, G. E., M. Antonucci, C. De Pace, M. F. O'Reilly, J. Sigaeoos, N. N. Singh et D. Oliva. « Enabling Two Adolescents with Multiple Disabilities to Choose among Environmental Stimuli through Different Procedural and Technological Approaches ». Perceptual and Motor Skills 105, no 2 (octobre 2007) : 362–72. http://dx.doi.org/10.2466/pms.105.2.362-372.
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Two single-case studies were carried out using different procedural and technological approaches to enable two adolescents with multiple disabilities to choose among environmental stimuli. Study I focused on replicating a recently developed procedure, which relied on samples of the auditory stimuli available as cues for choice responses. Study II assessed a new procedural and technical setup relying on the use of pictorial representations of the stimuli available as cues for choice responses. The auditory samples and the pictorial representations were presented through computer systems. The participants' choice responses relied on microswitches connected to the computer systems. The data of Study I fully supported previous findings with the same procedural approach. The participant learned to choose preferred stimuli and bypass nonpreferred ones. The data of Study II showed that the participant learned to concentrate his choice responses on a few stimuli, suggesting that these stimuli were actually preferred and that responding was purposeful. Implications of the results were discussed.
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Percaccio, Cherie R., Navzer D. Engineer, Autumn L. Pruette, Pritesh K. Pandya, Raluca Moucha, Daniel L. Rathbun et Michael P. Kilgard. « Environmental Enrichment Increases Paired-Pulse Depression in Rat Auditory Cortex ». Journal of Neurophysiology 94, no 5 (novembre 2005) : 3590–600. http://dx.doi.org/10.1152/jn.00433.2005.
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Temporal features are important for the identification of natural sounds. Earlier studies have shown that cortical processing of temporal information can be altered by long-term experience with modulated sounds. In a previous study, we observed that environmental enrichment dramatically increased the response of cortical neurons to single tone and noise burst stimuli in both awake and anesthetized rats. Here, we evaluate how enrichment influences temporal information processing in the auditory cortex. We recorded responses to repeated tones and noise bursts in awake rats using epidural evoked potentials and in anesthetized rats using microelectrodes. Enrichment increased the response of cortical neurons to stimuli presented at slow rates and decreased the response to stimuli presented at fast rates relative to controls. Our observation that enrichment substantially increased response strength and forward masking is consistent with earlier reports that long-term potentiation of cortical synapses is associated with increased paired-pulse depression. Enrichment also increased response synchronization at slow rates and decreased synchronization at fast rates. Paired-pulse depression increased within days of environmental enrichment and was restored to normal levels after return to standard housing conditions. These results are relevant to several clinical disorders characterized by abnormal gating of sensory information, including autism, schizophrenia, and dyslexia.
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Krauel, Kerstin, Philipp Schott, Bernfried Sojka, Bettina M. Pause et Roman Ferstl. « Is There a Mismatch Negativity Analogue in the Olfactory Event-Related Potential ? » Journal of Psychophysiology 13, no 1 (janvier 1999) : 49–55. http://dx.doi.org/10.1027//0269-8803.13.1.49.
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Abstract The mismatch negativity (MMN) is thought to indicate automatic stimulus discrimination in response to acoustic stimuli. In the present study six male subjects were presented with the odors linalool and eugenol within a passive oddball-paradigm. The subjects were instructed to ignore the odors and concentrate on an auditory distractor task. In two sessions each odor served once as the standard stimulus and once as the deviant stimulus. Both odors when presented as deviants led to a negative deflection of the olfactory event-related potential (OERP) between 500-600 ms. After 600 ms the waveforms in response to the deviants were differentially influenced by odor quality. Although the present study should be understood as exploratory, the results suggest the existence of an early mismatch detector in the olfactory modality independent of attention and odor quality.
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Zlatkova-Doncheva, Katerina. « A Multisensory Approach to Teaching Students with Dyslexia ». Pedagogical Almanac 30, no 1 (29 juin 2022) : 70–78. http://dx.doi.org/10.54664/xuav9711.
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The current study traces basic concepts about multisensory techniques in education, and outlines the main outcomes in the education of children with dyslexia. A review is conducted of various studies on multisensory education in neurological and pedagogical contexts. The focus of the article is on increasing the reading skills and literacy of students with dyslexia through a multisensory approach and the use of visual, tactile, auditory, motor, and olfactory stimuli. This publication can support the efforts of teachers, special educators and resource teachers to implement multisensory learning and to improve the personal development of students with dyslexia, as well as of their peers.
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Kulahci, Ipek G., Christine M. Drea, Daniel I. Rubenstein et Asif A. Ghazanfar. « Individual recognition through olfactory–auditory matching in lemurs ». Proceedings of the Royal Society B : Biological Sciences 281, no 1784 (7 juin 2014) : 20140071. http://dx.doi.org/10.1098/rspb.2014.0071.
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Individual recognition can be facilitated by creating representations of familiar individuals, whereby information from signals in multiple sensory modalities become linked. Many vertebrate species use auditory–visual matching to recognize familiar conspecifics and heterospecifics, but we currently do not know whether representations of familiar individuals incorporate information from other modalities. Ring-tailed lemurs ( Lemur catta ) are highly visual, but also communicate via scents and vocalizations. To investigate the role of olfactory signals in multisensory recognition, we tested whether lemurs can recognize familiar individuals through matching scents and vocalizations. We presented lemurs with female scents that were paired with the contact call either of the female whose scent was presented or of another familiar female from the same social group. When the scent and the vocalization came from the same individual versus from different individuals, females showed greater interest in the scents, and males showed greater interest in both the scents and the vocalizations, suggesting that lemurs can recognize familiar females via olfactory–auditory matching. Because identity signals in lemur scents and vocalizations are produced by different effectors and often encountered at different times (uncoupled in space and time), this matching suggests lemurs form multisensory representations through a newly recognized sensory integration underlying individual recognition.
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Johnston, Daniel, Hauke Egermann et Gavin Kearney. « The Use of Binaural Based Spatial Audio in the Reduction of Auditory Hypersensitivity in Autistic Young People ». International Journal of Environmental Research and Public Health 19, no 19 (30 septembre 2022) : 12474. http://dx.doi.org/10.3390/ijerph191912474.
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Individuals diagnosed with autism spectrum disorder (ASD) are characterised as experiencing impairments in social-emotional interaction and communication, alongside frequently displaying repetitive behaviours and interests. Further to this, they are often described as experiencing difficulties in processing sensory information, with particular prevalence within the auditory modality. Provoked by common environmental sounds, auditory hypersensitivity can result in self-regulatory fear responses. Rather than a physiological pain reaction, literature suggests that these hypersensitivities are resulting through irrational fear of the sounds. This investigation evaluates the use of binaural based spatial audio as a rendering technique for delivering realistic simulations of averse stimuli within a virtual reality (VR) exposure based computer game intervention for auditory hypersensitivity in autism. Over multiple experimental sessions, 20 autistic participants experiencing auditory hypersensitivity were exposed to either spatial audio or stereo renders of target stimuli during the intervention. Measurements of self-reported emotions displayed significant reductions in associated negative emotional reactions to target stimuli for all participants. However, significant improvements were experienced by those listening to spatial audio simulations. Moreover, tracked voluntary interactions with exposure based game-mechanics increased as the study progressed. Providing further evidence of increased tolerance towards averse auditory stimuli.
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Getz, Wayne M. « A neural network for processing olfactory-like stimuli ». Bulletin of Mathematical Biology 53, no 6 (novembre 1991) : 805–23. http://dx.doi.org/10.1007/bf02461485.
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GETZ, W. « A neural network for processing olfactory-like stimuli ». Bulletin of Mathematical Biology 53, no 6 (1991) : 805–23. http://dx.doi.org/10.1016/s0092-8240(05)80408-2.
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Spence, Charles. « Temperature-Based Crossmodal Correspondences : Causes and Consequences ». Multisensory Research 33, no 6 (17 juin 2020) : 645–82. http://dx.doi.org/10.1163/22134808-20191494.
Texte intégralRésumé :
Abstract The last few years have seen an explosive growth of research interest in the crossmodal correspondences, the sometimes surprising associations that people experience between stimuli, attributes, or perceptual dimensions, such as between auditory pitch and visual size, or elevation. To date, the majority of this research has tended to focus on audiovisual correspondences. However, a variety of crossmodal correspondences have also been demonstrated with tactile stimuli, involving everything from felt shape to texture, and from weight through to temperature. In this review, I take a closer look at temperature-based correspondences. The empirical research not only supports the existence of robust crossmodal correspondences between temperature and colour (as captured by everyday phrases such as ‘red hot’) but also between temperature and auditory pitch. Importantly, such correspondences have (on occasion) been shown to influence everything from our thermal comfort in coloured environments through to our response to the thermal and chemical warmth associated with stimulation of the chemical senses, as when eating, drinking, and sniffing olfactory stimuli. Temperature-based correspondences are considered in terms of the four main classes of correspondence that have been identified to date, namely statistical, structural, semantic, and affective. The hope is that gaining a better understanding of temperature-based crossmodal correspondences may one day also potentially help in the design of more intuitive sensory-substitution devices, and support the delivery of immersive virtual and augmented reality experiences.
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Young, Bruce A., et Malinda Morain. « The use of ground-borne vibrations for prey localization in the Saharan sand vipers (Cerastes) ». Journal of Experimental Biology 205, no 5 (1 mars 2002) : 661–65. http://dx.doi.org/10.1242/jeb.205.5.661.
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SUMMARYSand vipers of the genus Cerastes are specialized semi-fossorial snakes that launch predatory strikes at rodents and lizards while partially buried in the soft sand of the Saharan desert. This study attempted to document which environmental stimuli are used by these snakes as a trigger for the ambush behavior. Denervating the olfactory and vomeronasal organs produced no changes in prey capture behavior in Cerastes cerastes. Occluding the eyes of the denervated specimens resulted in significant decreases in strike distance, diversity of strike angle and strike accuracy, demonstrating the importance of visual stimuli for target acquisition in this species. Nevertheless, every olfactory-denervated, temporarily blinded specimen succeeded in capturing free-ranging mice in every trial. Presentation of chemosensory-neutral targets to the olfactory-denervated, temporarily blinded specimens resulted in similar predatory behaviors, whether the target was isothermic to the environment or heated to mammalian body temperature. Collectively, these results provide evidence for the importance of visual stimuli during foraging in C. cerastes, the first experimental evidence for foraging by vibration detection in snakes and the strongest evidence to date that snakes are capable of ‘hearing’ vibrational stimuli.
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Visser, M., et M. A. Lambon Ralph. « Differential Contributions of Bilateral Ventral Anterior Temporal Lobe and Left Anterior Superior Temporal Gyrus to Semantic Processes ». Journal of Cognitive Neuroscience 23, no 10 (octobre 2011) : 3121–31. http://dx.doi.org/10.1162/jocn_a_00007.
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Studies of semantic dementia and repetitive TMS have suggested that the bilateral anterior temporal lobes (ATLs) underpin a modality-invariant representational hub within the semantic system. However, it is not clear whether all ATL subregions contribute in the same way. We utilized distortion-corrected fMRI to investigate the pattern of activation in the left and right ATL when participants performed a semantic decision task on auditory words, environmental sounds, or pictures. This showed that the ATL is not functionally homogeneous but is more graded. Both left and right ventral ATL (vATL) responded to all modalities in keeping with the notion that this region underpins multimodality semantic processing. In addition, there were graded differences across the hemispheres. Semantic processing of both picture and environmental sound stimuli was associated with equivalent bilateral vATL activation, whereas auditory words generated greater activation in left than right vATL. This graded specialization for auditory stimuli would appear to reflect the input from the left superior ATL, which responded solely to semantic decisions on the basis of spoken words and environmental sounds, suggesting that this region is specialized to auditory stimuli. A final noteworthy result was that these regions were activated for domain level decisions to singly presented stimuli, which appears to be incompatible with the hypotheses that the ATL is dedicated (a) to the representation of specific entities or (b) for combinatorial semantic processes.
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Courtiol, Emmanuelle, et Donald A. Wilson. « Thalamic olfaction : characterizing odor processing in the mediodorsal thalamus of the rat ». Journal of Neurophysiology 111, no 6 (15 mars 2014) : 1274–85. http://dx.doi.org/10.1152/jn.00741.2013.
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Thalamus is a key crossroad structure involved in various functions relative to visual, auditory, gustatory, and somatosensory senses. Because of the specific organization of the olfactory pathway (i.e., no direct thalamic relay between sensory neurons and primary cortex), relatively little attention has been directed toward the thalamus in olfaction. However, an olfactory thalamus exists: the mediodorsal nucleus of the thalamus (MDT) receives input from various olfactory structures including the piriform cortex. How the MDT contributes to olfactory perception remains unanswered. The present study is a first step to gain insight into the function of the MDT in olfactory processing. Spontaneous and odor-evoked activities were recorded in both the MDT (single unit and local field potential) and the piriform cortex (local field potential) of urethane-anesthetized rats. We demonstrate that: 1) odorant presentation induces a conjoint, coherent emergence of beta-frequency-band oscillations in both the MDT and the piriform cortex; 2) 51% of MDT single units were odor-responsive with narrow-tuning characteristics across an odorant set, which included biological, monomolecular, and mixture stimuli. In fact, a majority of MDT units responded to only one odor within the set; 3) the MDT and the piriform cortex showed tightly related activities with, for example, nearly 20% of MDT firing in phase with piriform cortical beta-frequency oscillations; and 4) MDT-piriform cortex coherence was state-dependent with enhanced coupling during slow-wave activity. These data are discussed in the context of the hypothesized role of MDT in olfactory perception and attention.
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Gagnon, Robert, et John Patrick. « Vibroacoustic stimulation as a test for fetal health ». Fetal and Maternal Medicine Review 2, no 2 (juillet 1990) : 159–70. http://dx.doi.org/10.1017/s0965539500000036.
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The behavioural response of the neonate to stimuli is an essential part of neurological examination in the newborn infant in order to measure the integrity and function of the central nervous system. Different sensory channels, such as auditory, vibrotactile or olfactory, have been used to elicit a response. With use of real-time ultrasound, Nijhuis et al. observed that human fetuses of 36 weeks gestation had developed behavioural states (1F–4F) that were, in their organization, fully comparable to the states originally described by Prechtl et al. in neonates. Three variables are used to identify human fetal behavioural states: fetal heart rate (FHR) pattern (A-D), fetal eye movements and fetal body movements.
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Gagnon, Robert, et John Patrick. « Vibroacoustic stimulation as a test for fetal health ». Fetal and Maternal Medicine Review 2, no 2 (juillet 1990) : 159–69. http://dx.doi.org/10.1017/s0965539500000346.
Texte intégralRésumé :
The behavioural response of the neonate to stimuli is an essential part of neurological examination in the newborn infant in order to measure the integrity and function of the central nervous system. Different sensory channels, such as auditory, vibrotactile or olfactory, have been used to elicit a response. With use of real-time ultrasound, Nijhuis et al. observed that human fetuses of 36 weeks gestation had developed behavioural states (1F–4F) that were, in their organization, fully comparable to the states originally described by Prechtl et al. in neonates. Three variables are used to identify human fetal behavioural states: fetal heart rate (FHR) pattern (A-D), fetal eye movements and fetal body movements.
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Vicario, Carmelo Mario, Gaetano Rappo, Anna Maria Pepi et Massimiliano Oliveri. « Timing Flickers across Sensory Modalities ». Perception 38, no 8 (1 janvier 2009) : 1144–51. http://dx.doi.org/10.1068/p6362.
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In tasks requiring a comparison of the duration of a reference and a test visual cue, the spatial position of test cue is likely to be implicitly coded, providing a form of a congruency effect or introducing a response bias according to the environmental scale or its vectorial reference. The precise mechanism generating these perceptual shifts in subjective duration is not understood, although several studies suggest that spatial attentional factors may play a critical role. Here we use a duration comparison task within and across sensory modalities to examine if temporal performance is also modulated when people are exposed to spatial distractors involving different sensory modalities. Different groups of healthy participants performed duration comparison tasks in separate sessions: a time comparison task of visual stimuli during exposure to spatially presented auditory distractors; and a time comparison task of auditory stimuli during exposure to spatially presented visual distractors. We found the duration of visual stimuli biased depending on the spatial position of auditory distractors. Observers underestimated the duration of stimuli presented in the left spatial field, while there was an overestimation trend in estimating the duration of stimuli presented in the right spatial field. In contrast, timing of auditory stimuli was unaffected by exposure to visual distractors. These results support the existence of multisensory interactions between space and time showing that, in cross-modal paradigms, the presence of auditory distractors can modify visuo-temporal perception but not vice versa. This asymmetry is discussed in terms of sensory–perceptual differences between the two systems.
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Mullins, R. Timothy. « Causal Uncertainty and Contextual Cues in the Recognition of Environmental Sounds ». Proceedings of the Human Factors Society Annual Meeting 32, no 4 (octobre 1988) : 247–51. http://dx.doi.org/10.1177/154193128803200408.
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Previous research has supported the hypothesis that the recognition of environmental sounds is complicated by uncertainty caused by the number of potential causes of that sound. In natural settings, contextual cues often help to specify the source of ambiguous sounds. This proposes the question of whether contextual cues can overpower auditory information to establish causal certainty of otherwise ambiguous environmental sounds. A study was conducted to examine this possibility. The results showed that contextual cues could have powerful effects on the judgement of the causal event of auditory stimuli. This result could have implications for tasks which are dependent on discrimination of auditory events. In particular, if a discrimination between two auditory events is critical, the effects of auditory context suggest that two or more possible alternatives might be indistinguishable in context and should be isolated for purposes of contrast.
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Hughes, P. E., P. H. Hemsworth et C. Hansen. « The effects of supplementary olfactory and auditory stimuli on the stimulus value and mating success of the young boar ». Applied Animal Behaviour Science 14, no 3 (septembre 1985) : 245–52. http://dx.doi.org/10.1016/0168-1591(85)90005-x.
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Freelance, Christopher B., Simon M. Tierney, Juanita Rodriguez, Devi M. Stuart-Fox, Bob B. M. Wong et Mark A. Elgar. « The eyes have it : dim-light activity is associated with the morphology of eyes but not antennae across insect orders ». Biological Journal of the Linnean Society 134, no 2 (12 juillet 2021) : 303–15. http://dx.doi.org/10.1093/biolinnean/blab088.
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Abstract The perception of cues and signals in visual, olfactory and auditory modalities underpins all animal interactions and provides crucial fitness-related information. Sensory organ morphology is under strong selection to optimize detection of salient cues and signals in a given signalling environment, the most well-studied example being selection on eye design in different photic environments. Many dim-light active species have larger compound eyes relative to body size, but little is known about differences in non-visual sensory organ morphology between diurnal and dim-light active insects. Here, we compare the micromorphology of the compound eyes (visual receptors) and antennae (olfactory and mechanical receptors) in representative pairs of day active and dim-light active species spanning multiple taxonomic orders of insects. We find that dim-light activity is associated with larger compound eye ommatidia and larger overall eye surface area across taxonomic orders but find no evidence that morphological adaptations that enhance the sensitivity of the eye in dim-light active insects are accompanied by morphological traits of the antennae that may increase sensitivity to olfactory, chemical or physical stimuli. This suggests that the ecology and natural history of species is a stronger driver of sensory organ morphology than is selection for complementary investment between sensory modalities.