Relevant bibliographies by topics / Visual oscillations

Academic literature on the topic 'Visual oscillations'

Author: Grafiati
Published: 10 March 2023
Last updated: 11 March 2023

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Journal articles on the topic "Visual oscillations"

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Young, M. P., K. Tanaka, and S. Yamane. "On oscillating neuronal responses in the visual cortex of the monkey." Journal of Neurophysiology 67, no. 6 (June 1, 1992): 1464–74. http://dx.doi.org/10.1152/jn.1992.67.6.1464.

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1. Recent studies of visual processing in the cat have shown stimulus-related oscillations in the 30- to 70-Hz range. We sought to replicate these findings in the monkey. 2. We recorded multiunit activity (MUA) and local field potentials (LFP) in areas V1 and middle-temporal area (MT), and MUA from the inferotemporal cortex (IT) of monkeys (Macaca fuscata). Recordings in all areas were made under conditions of anesthesia as close as possible to those in previous studies of oscillating responses in the cat. In addition, we recorded MUA in the IT of behaving monkeys while the monkeys performed a face discrimination task. 3. In areas V1 and MT, LFP power spectra showed broadband increases (1-100 Hz) in amplitude on stimulation by swept optimally oriented light bars, and not a shift in power from low to midfrequency, as has been reported in the cat. 4. MUA autocorrelograms (ACGs) classified by fitting Gabor functions, showed oscillations at approximately 10% of recording sites in V1 and MT, but these oscillations were in the alpha range (12-13 Hz). 5. MUA ACGs from IT in the anesthetized monkey showed no oscillations. 6. For MUA ACGs from IT in the behaving monkey, only two recording sites (out of 50) showed an oscillating response, with frequencies of 44 and 48 Hz. One oscillating response was associated with stimulation, and the other was associated with the absence of stimulation. 7. The very low incidence in the monkey of oscillating responses in the 30- to 70-Hz range (2 in 424 recordings made at 142 recording sites) and the absence of stimulus dependence suggest that such oscillations are unlikely to serve a function in the monkey, and that there may be a species difference between monkey and cat in the dynamics of neural activity in the visual cortex. 8. We found that methods of classifying responses as oscillating used in some of the studies of the cat may have led to overestimation of both the number of sites showing oscillation and the number of pairs of sites showing phase coherence. These problems arise from the failure to take account of badness of fit between Gabor functions and their corresponding ACGs, and from Gabor functions "ringing" in response to short phasic phenomena that could be consistent with nonoscillatory activity.
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Benedetto, Alessandro, Donatella Spinelli, and M. Concetta Morrone. "Rhythmic modulation of visual contrast discrimination triggered by action." Proceedings of the Royal Society B: Biological Sciences 283, no. 1831 (May 25, 2016): 20160692. http://dx.doi.org/10.1098/rspb.2016.0692.

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Recent evidence suggests that ongoing brain oscillations may be instrumental in binding and integrating multisensory signals. In this experiment, we investigated the temporal dynamics of visual–motor integration processes. We show that action modulates sensitivity to visual contrast discrimination in a rhythmic fashion at frequencies of about 5 Hz (in the theta range), for up to 1 s after execution of action. To understand the origin of the oscillations, we measured oscillations in contrast sensitivity at different levels of luminance, which is known to affect the endogenous brain rhythms, boosting the power of alpha-frequencies. We found that the frequency of oscillation in sensitivity increased at low luminance, probably reflecting the shift in mean endogenous brain rhythm towards higher frequencies. Importantly, both at high and at low luminance, contrast discrimination showed a rhythmic motor-induced suppression effect, with the suppression occurring earlier at low luminance. We suggest that oscillations play a key role in sensory–motor integration, and that the motor-induced suppression may reflect the first manifestation of a rhythmic oscillation.
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Welle, Cristin G., and Diego Contreras. "Sensory-driven and spontaneous gamma oscillations engage distinct cortical circuitry." Journal of Neurophysiology 115, no. 4 (April 1, 2016): 1821–35. http://dx.doi.org/10.1152/jn.00137.2015.

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Gamma oscillations are a robust component of sensory responses but are also part of the background spontaneous activity of the brain. To determine whether the properties of gamma oscillations in cortex are specific to their mechanism of generation, we compared in mouse visual cortex in vivo the laminar geometry and single-neuron rhythmicity of oscillations produced during sensory representation with those occurring spontaneously in the absence of stimulation. In mouse visual cortex under anesthesia (isoflurane and xylazine), visual stimulation triggered oscillations mainly between 20 and 50 Hz, which, because of their similar functional significance to gamma oscillations in higher mammals, we define here as gamma range. Sensory representation in visual cortex specifically increased gamma oscillation amplitude in the supragranular (L2/3) and granular (L4) layers and strongly entrained putative excitatory and inhibitory neurons in infragranular layers, while spontaneous gamma oscillations were distributed evenly through the cortical depth and primarily entrained putative inhibitory neurons in the infragranular (L5/6) cortical layers. The difference in laminar distribution of gamma oscillations during the two different conditions may result from differences in the source of excitatory input to the cortex. In addition, modulation of superficial gamma oscillation amplitude did not result in a corresponding change in deep-layer oscillations, suggesting that superficial and deep layers of cortex may utilize independent but related networks for gamma generation. These results demonstrate that stimulus-driven gamma oscillations engage cortical circuitry in a manner distinct from spontaneous oscillations and suggest multiple networks for the generation of gamma oscillations in cortex.
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Ro, Tony. "Alpha Oscillations and Feedback Processing in Visual Cortex for Conscious Perception." Journal of Cognitive Neuroscience 31, no. 7 (July 2019): 948–60. http://dx.doi.org/10.1162/jocn_a_01397.

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Variability in perception between individuals may be a consequence of different inherent neural processing speeds. To assess whether alpha oscillations systematically reflect a feedback pacing mechanism for cortical processing during visual perception, comparisons were made between alpha oscillations, visual suppression from TMS, visual evoked responses, and metacontrast masking. Peak alpha oscillation frequencies, measured through scalp EEG recordings, significantly correlated with the optimum latencies for visual suppression from TMS of early visual cortex. Individuals with shorter alpha periods (i.e., higher peak alpha frequencies) processed visual information faster than those with longer alpha periods (i.e., lower peak alpha frequencies). Moreover, peak alpha oscillation periods and optimum TMS visual suppression latencies predicted the latencies of late but not early visual evoked responses. Together, these findings demonstrate an important role of alpha oscillatory and late feedback activity in visual cortex for conscious perception. They also show that the timing for visual awareness varies across individuals, depending on the pace of one's endogenous oscillatory cycling frequency.
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Wang, Wei, Kaiming Yang, and Yu Zhu. "Optimal Frequency and Amplitude of Vertical Viewpoint Oscillation for Improving Vection Strength and Reducing Neural Constrains on Gait." Entropy 23, no. 5 (April 28, 2021): 541. http://dx.doi.org/10.3390/e23050541.

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Inducing self-motion illusions referred as vection are critical for improving the sensation of walking in virtual environments (VE). Adding viewpoint oscillations to a constant forward velocity in VE is effective for improving vection strength under static conditions. However, the effects of oscillation frequency and amplitude on vection strength under treadmill walking conditions are still unclear. Besides, due to the visuomotor entrainment mechanism, these visual oscillations would affect gait patterns and be detrimental for achieving natural walking if not properly designed. This study was aimed at determining the optimal frequency and amplitude of vertical viewpoint oscillations for improving vection strength and reducing gait constraints. Seven subjects walked on a treadmill while watching a visual scene. The visual scene presented a constant forward velocity equal to the treadmill velocity with different vertical viewpoint oscillations added. Five oscillation patterns with different combinations of frequency and amplitude were tested. Subjects gave verbal ratings of vection strength. The mediolateral (M-L) center of pressure (CoP) complexity was calculated to indicate gait constraints. After the experiment, subjects were asked to give the best and the worst oscillation pattern based on their walking experience. The oscillation frequency and amplitude had strong positive correlations with vection strength. The M-L CoP complexity was reduced under oscillations with low frequency. The medium oscillation amplitude had greater M-L CoP complexity than the small and large amplitude. Besides, subjects preferred those oscillation patterns with large gait complexity. We suggested that the oscillation amplitude with largest M-L CoP complexity should first be chosen to reduce gait constraints. Then, increasing the oscillation frequency to improve vection strength until individual preference or the boundary of motion sickness. These findings provide important guidelines to promote the sensation of natural walking in VE.
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Mureşan, Raul C., Ovidiu F. Jurjuţ, Vasile V. Moca, Wolf Singer, and Danko Nikolić. "The Oscillation Score: An Efficient Method for Estimating Oscillation Strength in Neuronal Activity." Journal of Neurophysiology 99, no. 3 (March 2008): 1333–53. http://dx.doi.org/10.1152/jn.00772.2007.

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We present a method that estimates the strength of neuronal oscillations at the cellular level, relying on autocorrelation histograms computed on spike trains. The method delivers a number, termed oscillation score, that estimates the degree to which a neuron is oscillating in a given frequency band. Moreover, it can also reliably identify the oscillation frequency and strength in the given band, independently of the oscillation in other frequency bands, and thus it can handle superimposed oscillations on multiple scales ( theta, alpha, beta, gamma, etc.). The method is relatively simple and fast. It can cope with a low number of spikes, converging exponentially fast with the number of spikes, to a stable estimation of the oscillation strength. It thus lends itself to the analysis of spike-sorted single-unit activity from electrophysiological recordings. We show that the method performs well on experimental data recorded from cat visual cortex and also compares favorably to other methods. In addition, we provide a measure, termed confidence score, that determines the stability of the oscillation score estimate over trials.
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Sánchez-Arias, Mônica Del Rosario, Ana Francisca Rozin Kleiner, Ágata Yoko Yasue Hamanaka, Paulo Roberto Pereira Santiago, Lilian Teresa Bucken Gobbi, and Florindo Stella. "Visual restriction and anterior-posterior body oscillations in Parkinson’s disease." Acta Fisiátrica 19, no. 3 (September 9, 2012): 161–66. http://dx.doi.org/10.11606/issn.2317-0190.v19i3a103709.

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With their vision restricted, sufferers of Parkinson’s disease (PD) make few anticipatory and/or compensatory adjustments in their posture and the evidence of these adjustments is even less when the disease progresses and body oscillations are considered. Objective: The aim of this study was to demonstrate the effects of visual restriction on the anterior-posterior body oscillation angles in parkinsonian stance considering the early stages of this disease. Method: Ten elderly PD patients with Hoehn & Yahr (HY) stage 2 remained standing still for 30 seconds to measure the body oscillation angles with and without restricted vision. Results: Two-way ANOVA analyses with repeated measurements revealed the main effect of vision (F(1,7) = 8.931, p < 0.02). Conclusion: The angles of the anterior-posterior body oscillations without visibility were greater than with visibility. They did not differ in correlation with the HY stages and visibility conditions interfered with the postural control regardless of the PD evolution stage.
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Mathewson, Kyle E., Christopher Prudhomme, Monica Fabiani, Diane M. Beck, Alejandro Lleras, and Gabriele Gratton. "Making Waves in the Stream of Consciousness: Entraining Oscillations in EEG Alpha and Fluctuations in Visual Awareness with Rhythmic Visual Stimulation." Journal of Cognitive Neuroscience 24, no. 12 (December 2012): 2321–33. http://dx.doi.org/10.1162/jocn_a_00288.

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Rhythmic events are common in our sensory world. Temporal regularities could be used to predict the timing of upcoming events, thus facilitating their processing. Indeed, cognitive theories have long posited the existence of internal oscillators whose timing can be entrained to ongoing periodic stimuli in the environment as a mechanism of temporal attention. Recently, recordings from primate brains have shown electrophysiological evidence for these hypothesized internal oscillations. We hypothesized that rhythmic visual stimuli can entrain ongoing neural oscillations in humans, locking the timing of the excitability cycles they represent and thus enhancing processing of subsequently predictable stimuli. Here we report evidence for entrainment of neural oscillations by predictable periodic stimuli in the alpha frequency band and show for the first time that the phase of existing brain oscillations cannot only be modified in response to rhythmic visual stimulation but that the resulting phase-locked fluctuations in excitability lead to concomitant fluctuations in visual awareness in humans. This entrainment effect was dependent on both the amount of spontaneous alpha power before the experiment and the level of 12-Hz oscillation before each trial and could not be explained by evoked activity. Rhythmic fluctuations in awareness elicited by entrainment of ongoing neural excitability cycles support a proposed role for alpha oscillations as a pulsed inhibition of cortical activity. Furthermore, these data provide evidence for the quantized nature of our conscious experience and reveal a powerful mechanism by which temporal attention as well as perceptual snapshots can be manipulated and controlled.
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Goldreich, D., R. J. Krauzlis, and S. G. Lisberger. "Effect of changing feedback delay on spontaneous oscillations in smooth pursuit eye movements of monkeys." Journal of Neurophysiology 67, no. 3 (March 1, 1992): 625–38. http://dx.doi.org/10.1152/jn.1992.67.3.625.

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1. Our goal was to discriminate between two classes of models for pursuit eye movements. The monkey's pursuit system and both classes of model exhibit oscillations around target velocity during tracking of ramp target motion. However, the mechanisms that determine the frequency of oscillations differ in the two classes of model. In "internal feedback" models, oscillations are controlled by internal feedback loops, and the frequency of oscillation does not depend strongly on the delay in visual feedback. In "image motion" models, oscillations are controlled by visual feedback, and the frequency of oscillation does depend on the delay in visual feedback. 2. We measured the frequency of oscillation during pursuit of ramp target motion as a function of the total delay for visual feedback. For the shortest feedback delays of approximately 70 ms, the frequency of oscillation was between 6 and 7 Hz. Increases in feedback delay caused decreases in the frequency of oscillation. The effect of increasing feedback delay was similar, whether the increases were produced naturally by dimming and decreasing the size of the tracking target or artificially with the computer. We conclude that the oscillations in eye velocity during pursuit of ramp target motion are controlled by visual inputs, as suggested by the image motion class of models. 3. Previous experiments had suggested that the visuomotor pathways for pursuit are unable to respond well to frequencies as high as the 6-7 Hz at which eye velocity oscillates in monkeys. We therefore tested the response to target vibration at an amplitude of +/- 8 degrees/s and frequencies as high as 15 Hz. For target vibration at 6 Hz, the gain of pursuit, defined as the amplitude of eye velocity divided by the amplitude of target velocity, was as high as 0.65. We conclude that the visuomotor pathways for pursuit are capable of processing image motion at high temporal frequencies. 4. The gain of pursuit was much larger when the target vibrated around a constant speed of 15 degrees/s than when it vibrated around a stationary position. This suggests that the pursuit pathways contain a switch that must be closed to allow the visuomotor pathways for pursuit to operate at their full gain. The switch apparently remains open for target vibration around a stationary position. 5. The responses to target vibration revealed a frequency at which eye velocity lagged target velocity by 180 degrees and at which one monkey showed a local peak in the gain of pursuit.(ABSTRACT TRUNCATED AT 400 WORDS)
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Garcia, Javier O., Emily D. Grossman, and Ramesh Srinivasan. "Evoked potentials in large-scale cortical networks elicited by TMS of the visual cortex." Journal of Neurophysiology 106, no. 4 (October 2011): 1734–46. http://dx.doi.org/10.1152/jn.00739.2010.

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Single pulses of transcranial magnetic stimulation (TMS) result in distal and long-lasting oscillations, a finding directly challenging the virtual lesion hypothesis. Previous research supporting this finding has primarily come from stimulation of the motor cortex. We have used single-pulse TMS with simultaneous EEG to target seven brain regions, six of which belong to the visual system [left and right primary visual area V1, motion-sensitive human middle temporal cortex, and a ventral temporal region], as determined with functional MRI-guided neuronavigation, and a vertex “control” site to measure the network effects of the TMS pulse. We found the TMS-evoked potential (TMS-EP) over visual cortex consists mostly of site-dependent theta- and alphaband oscillations. These site-dependent oscillations extended beyond the stimulation site to functionally connected cortical regions and correspond to time windows where the EEG responses maximally diverge (40, 200, and 385 ms). Correlations revealed two site-independent oscillations ∼350 ms after the TMS pulse: a theta-band oscillation carried by the frontal cortex, and an alpha-band oscillation over parietal and frontal cortical regions. A manipulation of stimulation intensity at one stimulation site (right hemisphere V1-V3) revealed sensitivity to the stimulation intensity at different regions of cortex, evidence of intensity tuning in regions distal to the site of stimulation. Together these results suggest that a TMS pulse applied to the visual cortex has a complex effect on brain function, engaging multiple brain networks functionally connected to the visual system with both invariant and site-specific spatiotemporal dynamics. With this characterization of TMS, we propose an alternative to the virtual lesion hypothesis. Rather than a technique that simulates lesions, we propose TMS generates natural brain signals and engages functional networks.
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Dissertations / Theses on the topic "Visual oscillations"

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Beardsley, Burt Jay. "The visual shape and multipole moments of the sun." Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184229.

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This thesis describes the 1983 solar shape investigation performed at the Santa Catalina Laboratory for Experimental Relativity by Astrometry (SCLERA). Solar diameter measurements, with the North Solar Pole defined as θ = 0° polar angle, have been made between the following polar coordinates: from θ = 0° to θ = 180° (the polar diameter), from θ = 90° to θ = -90° (the equatorial diameter), from θ = -45° to θ = 135° and from θ = 45° to θ = -135°. Expressing the Sun's apparent shape in terms of a Legendre series, these diameters have enabled the calculation of the P₂ (quadrupole) and P₄ (hexadecapole) shape coefficients. The theoretical framework used to provide a relationship between the observed shape of the Sun and the multipole moments of the solar gravitational potential field has been improved to include, in general, the effect of differential rotation in both latitude and radius. Using the shape coefficients and the theoretical framework, the gravitational potential multipole moments, expressed as the P₂ and P₄ coefficients of a Legendre series, have been found to be J₂ = (3.4 ± 1.3)E-6 and J₄ = (1.7 ± 1.1)E-6, respectively. It has been found that the contribution to the perihelion precession of Mercury's orbit, caused by the combined effects from the gravitational quadrupole term and general relativity, was approximately 1σ different from the observed amount after all other known Newtonian contributions had been removed from the observed precession. The total apparent oblateness ΔR (equator-polar radii) found from SCLERA observations is ΔR = 13.8 ± 1.3 milliarcseconds. The surface rotation contribution ΔR' to the apparent solar shape is ΔR' = 7.9 milliarcseconds. The quoted uncertainties represent formal statistical 1σ errors only. Also, it has been shown that large changes in the apparent limb darkening functions were occurring near the equatorial regions of the Sun during the time of the observations. Evidence for periodic shape distortions near the equator have also been found.
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Wieczorek, Kacper. "Investigating the relationship between microsaccades and oscillations in the human visual cortex." Thesis, Cardiff University, 2015. http://orca.cf.ac.uk/86785/.

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Neural oscillations play important roles in vision and attention. Most studies of oscillations use visual fixation to control the visual input. Small eye movements, called microsaccades, occur involuntarily ~ 1-2 times per second during fixation and they are also thought to play important roles in vision and attention. The aim of the work described in this thesis was to explore the relationship between microsaccades and oscillations in the human visual cortex. In Chapter 2, I describe how remote video eye tracking can be used to detect and characterize microsaccades during MEG recordings. Tracking based on the pupil position only, without corneal reflection, and with the participant’s head immobilized in the MEG dewar, resulted in high precision gaze tracking and enabled the following investigations. In Chapter 3, I investigated the relationship between induced visual gamma oscillations and microsaccades in a simple visual stimulation paradigm. I did not find evidence for the relationship. This finding supports the view that sustained gamma oscillations reflect local processing in cortical columns. In addition, early transient gamma response had a reduced amplitude on trials with microsaccades, however the exact nature of this effect will have to be determined in future studies. In Chapter 4, I investigated the relationship between alpha oscillations and microsaccades in covert spatial attention. I did not find evidence for a relationship between hemispheric lateralization of the alpha amplitude and the directional bias of microsaccades. I propose that microsaccades and alpha oscillations represent two independent attentional mechanisms - the former related to early attention shifting and the latter to maintaining sustained attention. In Chapter 5, I recorded, for the first time, microsaccade-related spectral responses. Immediately after their onset, microsaccades increased amplitude in theta and beta bands and this effect was modulated by stimulus type. Moreover, microsaccades reduced alpha amplitude ~ 0.3 s after their onset and this effect was independent of stimulus type. These results have important implications for the interpretation of the classical oscillatory effects in the visual cortex as well as for the role of microsaccades in vision and attention.
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Adjamian, Peyman. "Magnetoencephalography: technical improvements in image co-registration and studies of visual cortical oscillations." Thesis, Aston University, 2002. http://publications.aston.ac.uk/12253/.

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The work presented in this thesis is divided into two distinct sections. In the first, the functional neuroimaging technique of Magnetoencephalography (MEG) is described and a new technique is introduced for accurate combination of MEG and MRI co-ordinate systems. In the second part of this thesis, MEG and the analysis technique of SAM are used to investigate responses of the visual system in the context of functional specialisation within the visual cortex. In chapter one, the sources of MEG signals are described, followed by a brief description of the necessary instrumentation for accurate MEG recordings. This chapter is concluded by introducing the forward and inverse problems of MEG, techniques to solve the inverse problem, and a comparison of MEG with other neuroimaging techniques. Chapter two provides an important contribution to the field of research with MEG. Firstly, it is described how MEG and MRI co-ordinate systems are combined for localisation and visualisation of activated brain regions. A previously used co-registration methods is then described, and a new technique is introduced. In a series of experiments, it is demonstrated that using fixed fiducial points provides a considerable improvement in the accuracy and reliability of co-registration. Chapter three introduces the visual system starting from the retina and ending with the higher visual rates. The functions of the magnocellular and the parvocellular pathways are described and it is shown how the parallel visual pathways remain segregated throughout the visual system. The structural and functional organisation of the visual cortex is then described. Chapter four presents strong evidence in favour of the link between conscious experience and synchronised brain activity. The spatiotemporal responses of the visual cortex are measured in response to specific gratings. It is shown that stimuli that induce visual discomfort and visual illusions share their physical properties with those that induce highly synchronised gamma frequency oscillations in the primary visual cortex.
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Gallina, Jessica <1990&gt. "Alpha oscillations index the functionality and the plastic changes of the visual system." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amsdottorato.unibo.it/10265/1/Jessica_Gallina_PhD_Thesis.pdf.

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Alpha oscillations are linked to visual awareness and to the periodical sampling of visual information, suggesting that alpha rhythm reflect an index of the functionality of the posterior cortices, and hence of the visual system. Therefore, the present work described a series of studies investigating alpha oscillations as a biomarker of the functionality and the plastic modifications of the visual system in response to lesions to the visual cortices or to external stimulations. The studies presented in chapter 5 and 6 showed that posterior lesions alter alpha oscillations in hemianopic patients, with reduced alpha reactivity at the eyes opening and decreased alpha functional connectivity, especially in right-lesioned hemianopics, with concurrent dysfunctions in the theta range, suggesting a specialization of the right hemisphere in orchestrating alpha oscillations and coordinating complex interplays among different brain rhythms. The study presented in chapter 7 investigated a mechanism of rhythmical attentional sampling of visual information in healthy participants, showing that perceptual performance is influenced by a rhythmical mechanism of attentional allocation, occurring at lower-alpha frequencies (i.e., 7 Hz), when a single spatial location is monitored, and at lower frequencies (i.e., 5 Hz), when attention is allocated to two spatial locations. Moreover, the right hemisphere seemed to have a dominance in this rhythmical attentional sampling, distributing attentional resources to the entire visual field. Finally, the study presented in chapter 8 showed that prolonged visual entrainment induce long-term modulations of resting-state alpha activity in healthy participants, suggesting that persistent modifications in the functionality of the visual system are possible. Altogheter, these findings show that functional processes and plastic changes of the visual system are reflected in alpha oscillatory patterns. Therefore, investigating and promoting alpha oscillations may contribute to the development of rehabilitative protocols to ameliorate the functionality of the visual system, in brain lesioned patients.
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Myers, Nicholas. "The role of cortical oscillations in the control and protection of visual working memory." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:c85253e0-6713-4fbc-801b-5f5bc8dea705.

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Visual working memory (WM) is the ability to hold information in mind for a short time before acting on it. The capacity of WM is strikingly limited. To make the most of this precious resource, humans exhibit a high degree of cognitive flexibility: We can prioritize information that is relevant to behavior, and inhibit unnecessary distractions. This thesis examines some behavioral and neural correlates of flexibility in WM. When information is of particular importance, anticipatory attention can be directed to where it will likely appear. Oscillations in visual cortex, in the 10-Hz range, play an important role in regulating excitability of such prioritized locations. Chapter 4 describes how even spontaneous fluctuations in 10-Hz synchronization (measured by electroencephalography, EEG) before encoding influence WM. Chapters 2 and 3 describe how attention can be directed retrospectively to items even if they are already stored in WM. Chapter 3 discusses how retrospective cues change neural synchronization similarly to anticipatory cues. Behavioral and neural measures additionally indicate that the boosting of an item through retrospective cues does not require prolonged deployment of attention: rather, it may be a transient process. The second half of this thesis additionally examines how items are represented in visual WM. Chapter 5 summarizes a study using pattern analysis of magnetoencephalographic (MEG) and EEG data to decode features of visual templates stored in WM. Decoding appears transiently around the time when potential target stimuli are expected, in line with a flexible reactivation mechanism. Chapter 6 further examines separate cortical networks involved in protecting vs. updating items in WM, and tests whether task relevance changes how well WM contents can be decoded. Finally, Chapter 7 summarizes the thesis and discusses how attentional flexibility can merge WM with a wider range of sources of behavioral control.
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Lowe, Scott Corren. "Decoding information from neural populations in the visual cortex." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/28861.

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Visual perception in mammals is made possible by the visual system and the visual cortex. However, precisely how visual information is coded in the brain and how training can improve this encoding is unclear. The ability to see and process visual information is not an innate property of the visual cortex. Instead, it is learnt from exposure to visual stimuli. We first considered how visual perception is learnt, by studying the perceptual learning of contrast discrimination in macaques. We investigated how changes in population activity in the visual cortices V1 and V4 correlate with the changes in behavioural response during training on this task. Our results indicate that changes in the learnt neural and behavioural responses are directed toward optimising the performance on the training task, rather than a general improvement in perception of the presented stimulus type. We report that the most informative signal about the contrast of the stimulus within V1 and V4 is the transient stimulus-onset response in V1, 50 ms after the stimulus presentation begins. However, this signal does not become more informative with training, suggesting it is an innate and untrainable property of the system, on these timescales at least. Using a linear decoder to classify the stimulus based on the population activity, we find that information in the V4 population is closely related to the information available to the higher cortical regions involved with decision making, since the performance of the decoder is similar to the performance of the animal throughout training. These findings suggest that training the subject on this task directs V4 to improve its read out of contrast information contained in V1, and cortical regions responsible for decision making use this to improve the performance with training. The structure of noise correlations between the recorded neurons changes with training, but this does not appear to cause the increase in behavioural performance. Furthermore, our results suggest there is feedback of information about the stimulus into the visual cortex after 300 ms of stimulus presentation, which may be related to the high-level percept of the stimulus within the brain. After training on the task, but not before, information about the stimulus persists in the activity of both V1 and V4 at least 400 ms after the stimulus is removed. In the second part, we explore how information is distributed across the anatomical layers of the visual cortex. Cortical oscillations in the local field potential (LFP) and current source density (CSD) within V1, driven by population-level activity, are known to contain information about visual stimulation. However the purpose of these oscillations, the sites where they originate, and what properties of the stimulus is encoded within them is still unknown. By recording the LFP at multiple recording sites along the cortical depth of macaque V1 during presentation of a natural movie stimulus, we investigated the structure of visual information encoded in cortical oscillations. We found that despite a homogeneous distribution of the power of oscillations across the cortical depth, information was compartmentalised into the oscillations of the 4 Hz to 16 Hz range at the granular (G, layer 4) depths and the 60Hz to 170Hz range at the supragranular (SG, layers 1–3) depths, the latter of which is redundant with the population-level firing rate. These two frequency ranges contain independent information about the stimulus, which we identify as related to two spatiotemporal aspects of the visual stimulus. Oscillations in the visual cortex with frequencies < 40 Hz contain information about fast changes in low spatial frequency. Frequencies > 40 Hz and multi-unit firing rates contain information about properties of the stimulus related to changes, both slow and fast, at finer-grained spatial scales. The spatiotemporal domains encoded in each are complementary. In particular, both the power and phase of oscillations in the 7 Hz to 20Hz range contain information about scene transitions in the presented movie stimulus. Such changes in the stimulus are similar to saccades in natural behaviour, and this may be indicative of predictive coding within the cortex.
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Moratti, Stephan. "Modulation of stimulus driven neuronal oscillations by the emotional and motivational significance of visual stimuli." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=975676911.

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Le, Bec Benoît. "Lateral connectivity : propagation of network belief and hallucinatory-like states in the primary visual cortex." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS509.

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Dans le cortex visuel primaire (V1), nous avons examiné l’impact fonctionnel de séquences de mouvement apparent centripète provenant de la périphérie lointaine et convergeant vers le champ récepteur de cellules corticales le long de leur axe d’orientation préféré. A haute vitesse saccadique, la congruence anisotrope de stimuli élémentaires composants un mouvement cohérent est cruciale dans la diffusion et l’intégration latérale d’information contextuelle. Au niveau électrophysiologique, ces résultats correspondent à une avance de latence et à un gain d’amplitude des réponses sous et supraliminaires, indiquant l’existence d’un champ d’association dynamique où forme et mouvement sont liés dès V1. Restreindre le mouvement apparent à la périphérie silencieuse résulte en une invasion du champ récepteur par une activité prédictive. Celle-ci suggère l'existence d'un mécanisme de diffusion latérale propre à V1 permettant de résoudre le problème d’extrapolation du mouvement. Deuxièmement, nous postulons que les hallucinations géométriques reflètent une opposition spatiale longue distance de la connectivité horizontale qui structure l'organisation de l'activité spontanée de V1, s'exprimant au travers d'un modèle d'intéractions entre hypercolonnes. Nous avons créé des stimuli visuels dans lesquels la perturbation par un bruit en 1/fα d'un réseau fortement adapté à des inducteurs géométriques induit la perception de planforms opposés. Nos résultats suggèrent que ces percepts dynamiques correspondent à la propagation de vagues d'activités détectables au niveau de cellules de V1 sous la forme d'oscillations compatibles avec la géométrie locale et la dynamique des percepts
In the primary visual cortex (V1), we examined the functional impact of centripetal apparent motion sequences originating from the far periphery and converging towards the receptive field of cortical cells along their preferred orientation axis. At high saccadic speed, the anisotropic congruency of elementary stimuli composing a coherent motion is crucial in the diffusion and lateral integration of contextual information. At the electrophysiological level, those results correspond to a latency advance and an amplitude gain of sub and suprathreshold responses, indicating the existence of a dynamic association field where form and motion are already bound in V1. Restricting the apparent motion to the silent periphery result in an invasion of the receptive field by predictive activity. This latter suggests the existence of a mechanism of lateral diffusion intrinsic to V1 that allows to solve the motion extrapolation problem. Second, we posit that geometric hallucinations reflect a long-distance spatial opponency of horizontal connectivity that structure the self organization of V1 ongoing activity, expressing itself through a model of interacting hypercolumns resulting in the formation of neural stripes on V1 surface. We designed visual stimuli in which perturbation by a 1/fα noise of a network highly adapted to geometric inducers result in perception of opponent planforms. Our results suggest that those dynamic percepts correspond to propagating waves of synaptic activity that are detectable at the level of V1 cells under the form of oscillations compatible with the local geometry and the dynamic of the induced percepts
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ZAZIO, AGNESE. "Impact of ongoing alpha oscillations on visual perception and neurophysiological response: an integration with a psychophysical approach." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2019. http://hdl.handle.net/10281/241241.

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Le oscillazioni neurali sono considerate elementi costitutivi del funzionamento cognitivo, e negli ultimi decenni i neuroscienziati hanno sviluppato teorie fondamentali sul ruolo delle oscillazioni nelle dinamiche cerebrali. Recentemente, un crescente numero di evidenze ha mostrato come l’attività oscillatoria in corso possa rendere conto di una porzione considerevole della variabilità che si osserva nella prestazione comportamentale e nella risposta neurofisiologica. Nel dominio della percezione visiva, un ruolo cruciale è svolto dalle oscillazioni neurali nel range di frequenza alfa. Si ritiene che l’attività alfa eserciti una funzione inibitoria sull’elaborazione dello stimolo e rifletta l’eccitabilità corticale. E’ stato recentemente proposto che il ritmo alfa non possa essere considerato come un fenomeno unitario; tuttavia, si conosce ancora poco riguardo ai meccanismi neurali associati con l’attività alfa misurata attraverso registrazioni non invasive. Inoltre, fino ad ora la maggior parte degli studi sugli effetti dell’attività in corso sulla percezione visiva si è focalizzata su una particolare classe di stimoli, ovvero che hanno un’intensità vicino alla soglia sensoriale, e si conosce molto meno riguardo a cosa avvenga in risposta a stimoli la cui intensità va oltre il valore di soglia. Nel presente lavoro, ci siamo posti l’obiettivo di affrontare tali questioni studiando gli effetti dell’attività alfa in corso sulla risposta percettiva e neurofisiologica nel dominio visivo. Il primo obiettivo era quello di replicare alcune evidenze sugli effetti del power e della fase delle fluttuazioni spontanee dell’attività alfa pre-stimolo sulla detezione visiva, utilizzando stimoli a soglia. In aggiunta allo studio originale, l’utilizzo della magnetoencefalografia ci ha permesso di ricostruire le sorgenti cerebrali dell’attività oscillatoria pre-stimolo e dell’attività evocata. Un secondo studio era volto a modulare l’attività alfa in corso utilizzando un paradigma di deprivazione sensoriale, e testare gli effetti di tale modulazione attraverso un ampio range di intensità di stimolazione. L’uso della stimolazione magnetica transcranica (TMS) con simultanea registrazione elettroencefalografica ci ha permesso di valutare la risposta neurofisiologica e percettiva alla TMS, attraverso i potenziali evocati e la percezione dei fosfeni. Infine, in un terzo studio abbiamo sviluppato un modello formale sugli effetti dell’attività alfa in corso sulla percezione visiva, con l’obiettivo di distinguere possibili meccanismi neurali che non possono essere disambiguati a livello non-invasivo. Il modello è basato sulle interazioni cross-frequency tra l’inibizione funzionale di alfa e l’attività gamma dei neuroni sensoriali, e mette in evidenza i vantaggi di presentare un ampio range di intensità di stimoli nello studio degli effetti dell’attività oscillatoria, utilizzando un approccio psicofisico. Considerati insieme, i nostri risultati sono coerenti con la letteratura corrente riguardo alla funzione inibitoria svolta dall’attività alfa in corso sulla percezione visiva. Infatti, la risposta sia percettiva che neurofisiologica ad uno stimolo esterno era influenzata dall’attività alfa pre-stimolo, nelle fluttuazioni spontanee così come quando era modulata da un paradigma di deprivazione sensoriale. Inoltre, le presenti evidenze supportano l’ipotesi che le oscillazioni alfa sottendano meccanismi distinti, e mettono in luce come nuove intuizioni possano emergere dall’utilizzo di un approccio psicofisico allo studio dell’attività oscillatoria in corso sulla percezione. Utilizzando diversi approcci metodologici, il presente lavoro fornisce nuovi avanzamenti nello studio non-invasivo delle oscillazioni sul comportamento, nello specifico sull’inibizione dell’attività alfa sulla percezione visiva.
Neural oscillations are considered to be the building blocks of cognitive functioning, and in the last decades neuroscientists have developed fundamental theories on their role in brain dynamics. Recently, a growing body of evidences has shown that ongoing oscillatory activity can account for a considerable amount of variability in behavioral performance and in neurophysiological response. In the domain of visual perception, a crucial role is played by neural oscillations within alpha frequency range. Alpha activity is believed to exert an inhibitory function on stimulus processing and to reflect cortical excitability, both when it fluctuates spontaneously as well as when it is modulated, by top-down or bottom-up mechanisms. It has been recently suggested that alpha rhythm may not be considered as a unitary phenomenon; however, still little is known about the neural mechanisms associated with alpha activity as measured by non-invasive recordings. Furthermore, up to now most of the studies on the effects of ongoing alpha activity on visual perception focused on a special class of stimuli, i.e., with a near-threshold intensity, and much less is known about what happens in the response beyond sensory threshold. In the present work, we aimed at addressing these issues by studying the effects of ongoing alpha oscillations on perceptual and neurophysiological outcome in the visual domain. The first goal was to replicate recent findings on the effects of spontaneous fluctuations of pre-stimulus alpha power and phase on a visual detection task, by using near-threshold stimuli. In addition to the original study, the use of magnetoencephalography allowed us to reconstruct brain sources of pre-stimulus and evoked activity. In a second study, we aimed at modulating ongoing alpha activity by using a sensory deprivation paradigm, and tested the effects of such modulation by means of a wide range of stimulation intensities. The use of transcranial magnetic stimulation (TMS) with concurrent electroencephalography allowed to directly assess the neurophysiological and perceptual response to TMS, by means of TMS-evoked potentials and phosphene perception. Finally, in a third study we developed a formal model of the effects of ongoing alpha activity on visual perception, with the aim of disentangling possible neural mechanisms which cannot be discerned non-invasively. The model is based on cross-frequency interactions between alpha functional inhibition and gamma activity of sensory neurons and highlights the advantages of presenting a wide range of stimulus intensities in the study of the effects of pre-stimulus oscillatory activity, using a psychophysical approach. Taken together, our results are consistent with current literature about the inhibitory function played by ongoing alpha activity on visual perception. Indeed, both perceptual and neurophysiological response to an external stimulus were affected by pre-stimulus alpha activity, when it fluctuated spontaneously as well as when it was modulated by a sensory deprivation paradigm. Moreover, the present findings support the hypothesis that alpha oscillations subtend distinct mechanisms, and highlighted that new insights may arise from applying a psychophysical approach to the study of ongoing activity on perception. By using different methodological approaches, the present work provides novel advances in the field of non-invasive investigation of ongoing oscillations on behavior, specifically on alpha inhibition of visual perception.
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Barnes, William Halley [Verfasser], Ralf A. W. [Akademischer Betreuer] Galuske, and Matthias H. J. [Akademischer Betreuer] Munk. "Reversible Visual Hemineglect: the Role of Neural Oscillations in Primary Visual Cortex / William Barnes. Betreuer: Ralf A. W. Galuske ; Matthias H. J. Munk." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2016. http://nbn-resolving.de/urn:nbn:de:tuda-tuprints-51931.

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Books on the topic "Visual oscillations"

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ZnO bao mo zhi bei ji qi guang, dian xing neng yan jiu. Shanghai Shi: Shanghai da xue chu ban she, 2010.

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Shapiro, Kimron, and Simon Hanslmayr. The Role of Brain Oscillations in the Temporal Limits of Attention. Edited by Anna C. (Kia) Nobre and Sabine Kastner. Oxford University Press, 2014. http://dx.doi.org/10.1093/oxfordhb/9780199675111.013.037.

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Attention is the ubiquitous construct referring to the ability of the brain to focus resources on a subset of perceptual input which it is trying to process for a response. Attention has for a long time been studied with reference to its distribution across space where, for example, visual input from an attentionally monitored location is given preference over non-monitored (i.e. attended) locations. More recently, attention has been studied for its ability to select targets from among rapidly, sequentially presented non-targets at a fixed location, e.g. in visual space. The present chapter explores this latter function of attention for its relevance to behaviour. In so doing, it highlights what is becoming one of the most popular approaches to studying communication across the brain—oscillations—at various frequency ranges. In particular the authors discuss the alpha frequency band (8–12 Hz), where recent evidence points to an important role in the switching between processing external vs. internal events.
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Østermark-Johansen, Lene. Walter Pater's European Imagination. Oxford University PressOxford, 2022. http://dx.doi.org/10.1093/oso/9780192858757.001.0001.

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Abstract Walter Pater’s European Imagination addresses Pater’s literary cosmopolitanism as the first in-depth study of his fiction in dialogue with European literature. Pater’s short pieces of fiction, the so-called ‘imaginary portraits’, trace the development of the European self over a period of some two thousand years. They include elements of travelogue and art criticism, together with discourses on myth, history, and philosophy, and are not easily classified. With settings ranging from ancient Greece to nineteenth-century England, they engage with the visual arts and operate pictorially in a series of receding planes of frame, foreground, and background. Examining Pater’s methods of composition, use of narrative voice, and construction of character, the book draws on all of Pater’s oeuvre and includes discussions of a range of his unpublished manuscripts, essays, and reviews. It engages with Pater’s dialogue with the visual portrait and problematizes the oscillation between type and individual, the generic and the particular, which characterizes both the visual and the literary portrait. Exploring Pater’s involvement with nineteenth-century historiography and collective memory, the book positions Pater’s fiction solidly within such nineteenth-century genres as the historical novel and the Bildungsroman, while also discussing the portraits as specimens of biographical writing. As the ‘Ur-texts’ from which generations of modernist life-writing developed, Pater’s ‘imaginary portraits’ became pivotal for such modernist writers as Virginia Woolf and Harold Nicolson, and Walter Pater’s European Imagination explores such twentieth-century successors, together with French precursors like Sainte-Beuve and followers like Marcel Schwob.
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Bose, Shibani. Mega Mammals in Ancient India. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190120412.001.0001.

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The book ventures to look into eras bygone in order to chronicle the passage of three mega species—the rhinoceros (Rhinoceros unicornis), tiger (Panthera tigris), and elephant (Elephas maximus)—across millennia in early north India. It carefully sifts through an archive comprising faunal remains and visual depictions retrieved from the archaeological record as well as a gamut of Sanskrit, Pali, Prakrit, and classical Western accounts to document the presence of these mega animals in various cultural niches from hunter-gatherer societies to the first urban civilization of India and beyond. The narrative goes beyond treating these species as mere cultural icons to one that is also sensitive to their importance as markers of ecology. The focus is two-fold: to comprehend perceptions, attitudes, and sensibilities oscillating between veneration and persecution in order to reconstruct the cultural dimensions of human–megafaunal relations in the past, as also to use these species to understand the larger ecology of ancient India. At a time when the conservation of our megafaunal heritage is a major concern for biologists, ecologists as well as conservationists, this book underlines the need to historicize human interactions with these mega mammals keeping in mind that an animal’s past is critical in thinking about its future.
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Book chapters on the topic "Visual oscillations"

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Migliorelli, Carolina, Joan F. Alonso, Sergio Romero, Miguel A. Mañanas, Rafal Nowak, and Antonio Russi. "Visual Detection of High Frequency Oscillations in MEG." In Converging Clinical and Engineering Research on Neurorehabilitation II, 769–73. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-46669-9_126.

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Bush, Paul. "Realistic Network Models of Synchronized Oscillations in Visual Cortex." In Cerebral Cortex, 511–23. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4903-1_10.

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Ota, Yusuke, Yusuke Ujitoko, Yuki Ban, Sho Sakurai, and Koichi Hirota. "Surface Roughness Judgment During Finger Exploration Is Changeable by Visual Oscillations." In Haptics: Science, Technology, Applications, 33–41. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-58147-3_4.

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Gray, Charles M., Andreas K. Engel, Peter König, and Wolf Singer. "Mechanisms Underlying the Generation of Neuronal Oscillations in Cat Visual Cortex." In Induced Rhythms in the Brain, 29–45. Boston, MA: Birkhäuser Boston, 1992. http://dx.doi.org/10.1007/978-1-4757-1281-0_2.

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Roelfsema, Pieter R., Andreas K. Engel, Peter König, and Wolf Singer. "Oscillations and Synchrony in the Visual Cortex: Evidence for Their Functional Relevance." In Oscillatory Event-Related Brain Dynamics, 99–114. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4899-1307-4_9.

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Gantchev, G. N., P. Gatev, N. Tankov, N. Draganova, S. Dunev, and D. Popivanov. "Role of the Visual Feedback for Stabilization of Vertical Human Posture during Induced Body Oscillations." In Motor Control, 129–34. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4615-7508-5_22.

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Lv, Bolin, Xiaolong Zhou, and Shengyong Chen. "Oscillation Detection and Parameter-Adaptive Hedge Algorithm for Real-Time Visual Tracking." In Pattern Recognition and Computer Vision, 233–44. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-03341-5_20.

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Tatsuno, M. "A Visual Study of the Flow Around an Oscillating Cylinder in a Stratified Fluid at Rest." In Flow Visualization VI, 348–52. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-84824-7_60.

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Hosaka, Ryosuke, Toshi Nakajima, Kazuyuki Aihara, Yoko Yamaguchi, and Hajime Mushiake. "Laterality of Gamma-Oscillations in Primate Supplementary Motor Area During Performance of Visually-Guided Movements." In Advances in Cognitive Neurodynamics (IV), 165–69. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-017-9548-7_23.

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Singer, Wolf. "Synchrony, Oscillations, and Relational Codes." In The Visual Neurosciences, 2-vol. set, 1665–81. The MIT Press, 2003. http://dx.doi.org/10.7551/mitpress/7131.003.0128.

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Conference papers on the topic "Visual oscillations"

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Huaying Song, Dan Zhang, Zhipei Ling, Huancong Zuo, and Bo Hong. "High gamma oscillations enhance the subdural visual speller." In 2012 34th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2012. http://dx.doi.org/10.1109/embc.2012.6346278.

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Heshmat, Mohamed, Mohamed Abdellatif, and Hossam Abbas. "Improving visual SLAM accuracy through deliberate camera oscillations." In 2013 IEEE International Symposium on Robotic and Sensors Environments (ROSE). IEEE, 2013. http://dx.doi.org/10.1109/rose.2013.6698435.

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Rapela, J., K. Gramann, M. Westerfield, J. Townsend, and S. Makeig. "Brain oscillations in switching vs. focusing audio-visual attention." In 2012 34th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2012. http://dx.doi.org/10.1109/embc.2012.6345941.

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Deng, Bin, Yanxue Ren, and Chaofei Hong. "Synchronous Oscillations Influenced by Synaptic Dynamics in Visual Cortical Column Model." In 2019 Chinese Control Conference (CCC). IEEE, 2019. http://dx.doi.org/10.23919/chicc.2019.8866307.

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Moridis, Christos N., Manousos A. Klados, Ioannis A. Kokkinakis, Vasileios Terzis, Anastasios A. Economides, Anna Karlovasitou, Panagiotis D. Bamidis, and Vasileios E. Karabatakis. "The impact of audio-visual stimulation on alpha brain oscillations: An EEG study." In 2010 10th IEEE International Conference on Information Technology and Applications in Biomedicine (ITAB 2010). IEEE, 2010. http://dx.doi.org/10.1109/itab.2010.5687651.

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Greco, Alberto, Gaetano Valenza, and Enzo Pasquale Scilingo. "Valence-dependent changes in visual arousing elicitation: An exploratory study in EEG gamma oscillations." In 2016 38th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2016. http://dx.doi.org/10.1109/embc.2016.7591741.

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Tellamekala, Mani Kumar, and Mohammad Rafi. "Fragrance effect on beta band oscillations of primary visual and prefrontal cortices for reading tasks." In 2016 International Conference on Signal Processing and Communications (SPCOM). IEEE, 2016. http://dx.doi.org/10.1109/spcom.2016.7746640.

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Petros, Fitsum E., Matthew E. Klenk, and Sunil K. Agrawal. "Changes in Gait Parameters due to Visual and Head Oscillations in Football Players and Non-athletes." In 2022 9th IEEE RAS/EMBS International Conference for Biomedical Robotics and Biomechatronics (BioRob). IEEE, 2022. http://dx.doi.org/10.1109/biorob52689.2022.9925471.

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Матюнин, Andrey Matyunin, Николадзе, Georgiy Nikoladze, Поляков, Petr Polyakov, Колотов, and O. Kolotov. "Features of the 180º pulsed magnetization reversal of ferrite-garnet films with biaxial anisotropy in their plane." In XXIV International Conference. Москва: Infra-m, 2016. http://dx.doi.org/10.12737/23119.

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The calculations and experimental studies have shown that the intensity of nonlinear magnetization oscillations arising during the process of 180 pulsed magnetization reversal of real ferrite-garnet films with biaxial anisotropy weakly depends on the magnetization reversal pulse Hp frontf duration (in contrast to magnetic materials with uniaxial anisotropy). The pulsed magnetization reversalcurve, which provides a visual representation of the magnetization reversal speed saturation caused by the influence of nonlinear magnetization oscillations, analyzed for the first time.
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Mideksa, K. G., N. Hoogenboom, H. Hellriegel, H. Krause, A. Schnitzler, G. Deuschl, J. Raethjen, U. Heute, and M. Muthuraman. "Comparison of EEG and MEG in source localization of induced human gamma-band oscillations during visual stimulus." In 2015 37th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2015. http://dx.doi.org/10.1109/embc.2015.7320278.

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