Journal articles: 'Hemispheric activation'

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Nikolaenko, N. N., A. Y. Egorov, and E. A. Freiman. "Representation Activity of The Right and Left Hemispheres of the Brain." Behavioural Neurology 10, no. 2-3 (1997): 49–59. http://dx.doi.org/10.1155/1997/101703.

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Drawings by psychiatric patients were studied in various states (i) in depression; (ii) after neuroleptic injection; and (iii) during left hemisphere suppression induced by unilateral electroconvulsive seizure (UES). In these states, right hemisphere activation predominates. The results of the study demonstrate that, under the predominance of right hemisphere activation over the left hemisphere, there is a tendency to reproduce the image of the object and to represent it in near space. Drawings by psychiatric patients were also investigated in (i) the manic state; (ii) after injection of psychotropic drugs which improved the mood; and (iii) during right hemisphere suppression following right-sided UES. Under these conditions, left hemisphere activation predominates and the drawings loose the illusion of three-dimensional space. A tendency to reproduce the knowledge and the ideas of the object and to represent it in distant space was observed. Thus, both hemispheres may represent space and elaborate perceptive and conceptional models of the world in different ways. It is probable that different types of representation are based on global (right-hemispheric) in comparison with focal (left-hemispheric) attention to space.

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Vidal, A. Cristina, Paula Banca, Augusto G. Pascoal, Gustavo C. Santo, João Sargento-Freitas, Ana Gouveia, and Miguel Castelo-Branco. "Bilateral versus ipsilesional cortico-subcortical activity patterns in stroke show hemispheric dependence." International Journal of Stroke 12, no. 1 (October 22, 2016): 71–83. http://dx.doi.org/10.1177/1747493016672087.

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Background Understanding of interhemispheric interactions in stroke patients during motor control is an important clinical neuroscience quest that may provide important clues for neurorehabilitation. In stroke patients, bilateral overactivation in both hemispheres has been interpreted as a poor prognostic indicator of functional recovery. In contrast, ipsilesional patterns have been linked with better motor outcomes. Aim We investigated the pathophysiology of hemispheric interactions during limb movement without and with contralateral restraint, to mimic the effects of constraint-induced movement therapy. We used neuroimaging to probe brain activity with such a movement-dependent interhemispheric modulation paradigm. Methods We used an fMRI block design during which the plegic/paretic upper limb was recruited/mobilized to perform unilateral arm elevation, as a function of presence versus absence of contralateral limb restriction ( n = 20, with balanced left/right lesion sites). Results Analysis of 10 right-hemispheric stroke participants yielded bilateral sensorimotor cortex activation in all movement phases in contrast with the unilateral dominance seen in the 10 left-hemispheric stroke participants. Superimposition of contralateral restriction led to a prominent shift from activation to deactivation response patterns, in particular in cortical and basal ganglia motor areas in right-hemispheric stroke. Left-hemispheric stroke was in general characterized by reduced activation patterns, even in the absence of restriction, which induced additional cortical silencing. Conclusion The observed hemispheric-dependent activation/deactivation shifts are novel and these pathophysiological observations suggest short-term neuroplasticity that may be useful for hemisphere-tailored neurorehabilitation.

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Estes, Rebecca I., James Jerger, and Gary Jacobson. "Reversal of Hemispheric Asymmetry on Auditory Tasks in Children Who Are Poor Listeners." Journal of the American Academy of Audiology 13, no. 02 (February 2002): 059–71. http://dx.doi.org/10.1055/s-0040-1715949.

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We examined hemispheric activation patterns during auditory and visual processing in two groups of children: 13 boys in the age range from 9 to 12 years rated by their parents and teachers as poor listeners and 11 boys in the same age range rated as normal listeners. Three tasks were employed: auditory gap detection, detection of auditory movement, and a control task involving visuospatial discrimination. Electrical activity was recorded from 30 scalp electrodes as participants responded to target stimuli in an event-related potential paradigm. In the visual task, hemispheric activation was relatively symmetric around the midsagittal plane in both groups. In the two auditory tasks, however, hemispheric activation patterns differed significantly between groups. In the normal-listener group, activation was asymmetric to the right hemisphere. In the poor-listener group, however, activation tended toward asymmetry, favoring the left hemisphere. These results suggest that abnormalities in hemispheric lateralization of function may underlie the auditory processing problems of at least some children described as poor listeners.

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Flöel, Agnes, Andreas Jansen, Michael Deppe, Martin Kanowski, Carsten Konrad, Jens Sommer, and Stefan Knecht. "Atypical Hemispheric Dominance for Attention: Functional MRI Topography." Journal of Cerebral Blood Flow & Metabolism 25, no. 9 (April 6, 2005): 1197–208. http://dx.doi.org/10.1038/sj.jcbfm.9600114.

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The right hemisphere is predominantly involved in tasks associated with spatial attention. However, left hemispheric dominance for spatial attention can be found in healthy individuals, and both spatial attention and language can be lateralized to the same hemisphere. Little is known about the underlying regional distribution of neural activation in these ‘atypical’ individuals. Previously a large number of healthy subjects were screened for hemispheric dominance of visuospatial attention and language, using functional Doppler ultrasonography. From this group, subjects were chosen who were ‘atypical’ for hemispheric dominance of visuospatial attention and language, and their pattern of brain activation was studied with functional magnetic resonance imaging during a task probing spatial attention. Right-handed subjects with the ‘typical’ pattern of brain organization served as control subjects. It was found that subjects with an inverted lateralization of language and spatial attention (language right, attention left) recruited left-hemispheric areas in the attention task, homotopic to those recruited by control subjects in the right hemisphere. Subjects with lateralization of both language and attention to the right hemisphere activated an attentional network in the right hemisphere that was comparable to control subjects. The present findings suggest that not the hemispheric side, but the intrahemispheric pattern of activation is the distinct feature for the neural processes underlying language and attention.

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Raine, Adrian, and Duncan Manders. "Schizoid personality, inter-hemispheric transfer, and left hemisphere over-activation." British Journal of Clinical Psychology 27, no. 4 (November 1988): 333–47. http://dx.doi.org/10.1111/j.2044-8260.1988.tb00798.x.

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OTTO, MICHAEL W., MICHAEL J. DOUGHER, and RONALD A. YEO. "Depression, Pain, and Hemispheric Activation." Journal of Nervous and Mental Disease 177, no. 4 (April 1989): 210–18. http://dx.doi.org/10.1097/00005053-198904000-00004.

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Kuiken, Don, and Jan Mathews. "EEG and Facial EMG Changes during Self-Reflection with Affective Imagery." Imagination, Cognition and Personality 6, no. 1 (September 1986): 55–66. http://dx.doi.org/10.2190/933r-0qv9-kh9y-mq4n.

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Intensive self-reflection with affective imagery was expected to increase relative right hemispheric activation and intensify facial expressions of negative affect. Six individuals were encouraged to reflect on personal problems or concerns in two different ways. In one condition, they attended to feelings related to a personal problem and characterized their feelings using imagery. In a second condition, they explained a personal problem and characterized their thoughts using words. In the feeling-imagery condition, participants' parietal EEG indicated greater relative right hemispheric activation, resulting in a pattern of bilateral hemispheric activation. There were no differences between conditions in corrugator or zygomatic EMG. The increased involvement of the right hemisphere during intensive self-reflection may facilitate discrimination of affect-related physiological events and, thus, affective insight.

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Morimoto, Hiroki M., Satoshi Hirose, Junichi Chikazoe, Koji Jimura, Tomoki Asari, Ken-ichiro Yamashita, Yasushi Miyashita, and Seiki Konishi. "On Verbal/Nonverbal Modality Dependence of Left and Right Inferior Prefrontal Activation during Performance of Flanker Interference Task." Journal of Cognitive Neuroscience 20, no. 11 (November 2008): 2006–14. http://dx.doi.org/10.1162/jocn.2008.20138.

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One of the most prevailing views on the functional localization of human cognition is the hemispheric specialization, wherein the left and right hemispheres are implicated primarily in verbal and nonverbal functions, respectively. Cognitive control is known to involve the lateral prefrontal cortex. However, it remains unclear whether the hemispheric specialization in the lateral prefrontal cortex can be observed in cognitive control per se, independent of sensory aspects of stimulus materials. In this functional magnetic resonance imaging study, we tested whether the verbal/nonverbal hemispheric specialization applies to the lateral prefrontal activation by investigating interference suppression, the ability to filter out irrelevant information in the environment. The flanker task was employed using a compound stimulus that contained a target and a flanker. The flanked stimulus was either a color word flanked by a colored patch or a colored patch flanked by a color word, which allowed us to manipulate the modality of the presented flanker stimulus from which interference originates, keeping the total stimulus modality balanced. The inferior frontal gyrus (IFG) showed prominent Modality-by-Hemisphere interaction in interference suppression, the left IFG being activated when a word flanker (plus a patch target) was presented and the right IFG being activated when a patch flanker (plus a word target) was presented. These results suggest that the verbal/nonverbal hemispheric specialization in the IFG can be explained by cognitive control processes per se, independent of sensory aspects of presented materials.

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McGettigan, Carolyn, Samuel Evans, Stuart Rosen, Zarinah K. Agnew, Poonam Shah, and Sophie K. Scott. "An Application of Univariate and Multivariate Approaches in fMRI to Quantifying the Hemispheric Lateralization of Acoustic and Linguistic Processes." Journal of Cognitive Neuroscience 24, no. 3 (March 2012): 636–52. http://dx.doi.org/10.1162/jocn_a_00161.

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The question of hemispheric lateralization of neural processes is one that is pertinent to a range of subdisciplines of cognitive neuroscience. Language is often assumed to be left-lateralized in the human brain, but there has been a long running debate about the underlying reasons for this. We addressed this problem with fMRI by identifying the neural responses to amplitude and spectral modulations in speech and how these interact with speech intelligibility to test previous claims for hemispheric asymmetries in acoustic and linguistic processes in speech perception. We used both univariate and multivariate analyses of the data, which enabled us to both identify the networks involved in processing these acoustic and linguistic factors and to test the significance of any apparent hemispheric asymmetries. We demonstrate bilateral activation of superior temporal cortex in response to speech-derived acoustic modulations in the absence of intelligibility. However, in a contrast of amplitude-modulated and spectrally modulated conditions that differed only in their intelligibility (where one was partially intelligible and the other unintelligible), we show a left dominant pattern of activation in STS, inferior frontal cortex, and insula. Crucially, multivariate pattern analysis showed that there were significant differences between the left and the right hemispheres only in the processing of intelligible speech. This result shows that the left hemisphere dominance in linguistic processing does not arise because of low-level, speech-derived acoustic factors and that multivariate pattern analysis provides a method for unbiased testing of hemispheric asymmetries in processing.

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Da̧bkowska, M., A. Borkowska, J. Rybakowskil, and A. Araszkiewicz. "Hemispheric activation in children with ADHD." European Neuropsychopharmacology 8 (November 1998): S299—S300. http://dx.doi.org/10.1016/s0924-977x(98)80587-7.

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Hayashi, Masaaki, Nobuaki Mizuguchi, Shohei Tsuchimoto, and Junichi Ushiba. "Neurofeedback of scalp bi-hemispheric EEG sensorimotor rhythm guides hemispheric activation of sensorimotor cortex in the targeted hemisphere." NeuroImage 223 (December 2020): 117298. http://dx.doi.org/10.1016/j.neuroimage.2020.117298.

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Janelle, Christopher M., Charles H. Hillman, Ross J. Apparies, Nicholas P. Murray, Launi Meili, Elizabeth A. Fallon, and Bradley D. Hatfield. "Expertise Differences in Cortical Activation and Gaze Behavior during Rifle Shooting." Journal of Sport and Exercise Psychology 22, no. 2 (June 2000): 167–82. http://dx.doi.org/10.1123/jsep.22.2.167.

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The purpose of this study was to examine whether variability in gaze behavior and cortical activation would differentiate expert (n = 12) and nonexpert (n = 13) small-bore rifle shooters. Spectral-activity and eye-movement data were collected concurrently during the course of a regulation indoor sequence of 40 shots from the standing position. Experts exhibited significantly superior shooting performance, as well as a significantly longer quiet eye period preceding shot execution than did nonexperts. Additionally, expertise interacted with hemispheric activation levels: Experts demonstrated a significant increase in left-hemisphere alpha and beta power, accompanied by a reduction in right-hemisphere alpha and beta power, during the preparatory period just prior to the shot. Nonexperts exhibited similar hemispheric asymmetry, but to a lesser extent than did experts. Findings suggest systematic expertise-related differences in ocular and cortical activity during the preparatory phase leading up to the trigger pull that reflects more optimal organization of the neural structures needed to achieve high-level performance.

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Behrens, Kazuko Y., Naomi I. Gribneau Bahm, Yingli Li, and Michael W. O'Boyle. "Electroencephalographic Responses to Photographs: A Case Study of Three Women with Distinct Adult Attachment Interview Classifications." Psychological Reports 108, no. 3 (June 2011): 993–1010. http://dx.doi.org/10.2466/02.07.09.21.pr0.108.3.993-1010.

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This preliminary study explored whether neurophysiological responses to visual stimuli, including attachment-related pictures, differed based on attachment status. Along with self-reported valence ratings and reaction times, recorded electroencephalographic (EEG) responses to a total of 100 images, 25 each of Positive, Negative, Neutral, and Personal (each participant's parents and child), were analyzed within and among three mothers with three attachment statuses (Dismissing, Preoccupied, and Secure), as judged by the Adult Attachment Interview (AAI). All three mothers gave their highest pleasantness ratings for Personal photographs. However, differences emerged when cross-region Alpha2 activation patterns in response to each picture type were compared amongst attachment categories. Alpha2 activation recorded during viewing of the participants' children's photographs was similar to viewing Negative pictures for mothers with insecure (Dismissing and Preoccupied) status; whereas the Alpha2 activation of the mother with Secure status towards photographs of her child was similar to Positive pictures. Different patterns of hemispheric asymmetry in Betal frequency when processing different picture types were also found. The mother with Dismissing status showed significantly stronger left-hemisphere Betal activation across all image types. The Preoccupied mother showed significantly stronger right-hemisphere Betal activation for all but the Neutral images, during which activation did not differ between the two hemispheres. The mother with Secure status showed significantly stronger Betal activation in the left hemisphere for all but parental Personal photos, during which activation did not differ between the two hemispheres. Implications from the current findings and future research possibilities are discussed.

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Markowitsch, Hans J., Alexander Thiel, Mechthild Reinkemeier, Josef Kessler, Adem Koyuncu, and Wolf-Dieter Heiss. "Right Amygdalar and Temporofrontal Activation During Autobiographic, But Not During Fictitious Memory Retrieval." Behavioural Neurology 12, no. 4 (2000): 181–90. http://dx.doi.org/10.1155/2000/303651.

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What distinguishes the recall of real-life experiences from that of self-created, fictitious emotionally laden information? Both kinds of information belong to the episodic memory system. Autobiographic memories constitute that part of the episodic memory system that is composed of significant life episodes, primarily of the distant past. Functional imaging was used to study the neural networks engaged in retrieving autobiographic and fictitious information of closely similar content. The principally activated brain regions overlapped considerably and constituted temporal and inferior prefrontal regions plus the cerebellum. Selective activations of the right amygdala and the right ventral prefrontal cortex (at the level of the uncinate fascicle interconnnecting prefrontal and temporopolar areas) were found when subtracting fictitious from autobiographic retrieval. Furthermore, distinct foci in the left temporal lobe were engaged. These data demonstrate that autobiographic memory retrieval uses (at least in non-brain damaged individuals) a network of right hemispheric ventral prefrontal and temporopolar regions and left hemispheric lateral temporal regions. It is concluded that it is the experiential character, its special emotional infiltration and its arousal which distinguishes memory of real-life from that of fictitious episodes. Consequently, our results point to the engagement of a bi-hemispheric network in which the right temporo-prefrontal hemisphere is likely to be responsible for the affective/arousal side of information retrieval and the left-hemispheric temporal gyrus for its engram-like representation. Portions of the neural activation found during retrieval might, however, reflect re-encoding processes as well.

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Weisz, J., L. Balázs, and G. Ádám. "The effect of hemispheric preference and hemispheric activation on heart- beat perception." International Journal of Psychophysiology 7, no. 2-4 (August 1989): 435–36. http://dx.doi.org/10.1016/0167-8760(89)90370-x.

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Saenko, I. V., L. A. Chernikova, A. E. Khizhnikova, E. I. Kremneva, and I. B. Kozlovskaya. "DYNAMICS OF THE PROCESSES OF INTER- AND INTRA-HEMISPHERIC INTERACTIONS (FUNCTIONAL CONNECTIVITY) OF THE BRAIN MOTOR ZONES RESPONSIBLE FOR WALKING IN NEURO-REHABILITATION OF PATIENTS WITH FOCAL DAMAGES OF THE CENTRAL NERVOUS SYSTEM." Aerospace and Environmental Medicine 54, no. 6 (2020): 136–43. http://dx.doi.org/10.21687/0233-528x-2020-54-6-136-143.

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The paper discusses the findings of studying neuroplastic transformations in the brain cortex owing to stroke patients therapy using soft multimodel exoskeleton complex (MEC) REGENT in comparison with activation of the cortex structures controlling locomotion in healthy people. The MEC course applied to hemiparetic patients increases walk speed; changes in the activity zones detected by functional magnetic resonance imaging (fMRI) attest to the positive trajectory of neuroplastic processes, i.e. activation in the precentral gyrus (primary motor cortex), secondary association cortex (inferior parietal lobule) on the damaged hemisphere, and right-side primary sensorimotor cortex. Analysis of the functional connectivity between the areas of interest before and after the MEC therapy elicited significant changes in the inter- and intra-hemispheric connections. This positive cortical reorganization has its origin in reduction of excitory interactions between the secondary associative areas (inferior parietal lobules in both hemispheres) and alleviation of the inhibitory interaction between the inferior parietal lobule and primary right-side sensorimotor cortex in the damaged hemisphere.

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Coghill, Robert C., Ian Gilron, and Michael J. Iadarola. "Hemispheric Lateralization of Somatosensory Processing." Journal of Neurophysiology 85, no. 6 (June 1, 2001): 2602–12. http://dx.doi.org/10.1152/jn.2001.85.6.2602.

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Processing of both painful and nonpainful somatosensory information is generally thought to be subserved by brain regions predominantly contralateral to the stimulated body region. However, lesions to right, but not left, posterior parietal cortex have been reported to produce a unilateral tactile neglect syndrome, suggesting that components of somatosensory information are preferentially processed in the right half of the brain. To better characterize right hemispheric lateralization of somatosensory processing, H2 15O positron emission tomography (PET) of cerebral blood flow was used to map brain activation produced by contact thermal stimulation of both the left and right arms of right-handed subjects. To allow direct assessment of the lateralization of activation, left- and right-sided stimuli were delivered during separate PET scans. Both innocuous (35°C) and painful (49°C) stimuli were employed to determine whether lateralized processing occurred in a manner related to perceived pain intensity. Subjects were also scanned during a nonstimulated rest condition to characterize activation that was not related to perceived pain intensity. Pain intensity-dependent and -independent changes in activation were identified in separate multiple regression analyses. Regardless of the side of stimulation, pain intensity–dependent activation was localized to contralateral regions of the primary somatosensory cortex, secondary somatosensory cortex, insular cortex, and bilateral regions of the cerebellum, putamen, thalamus, anterior cingulate cortex, and frontal operculum. No hemispheric lateralization of pain intensity–dependent processing was detected. In sharp contrast, portions of the thalamus, inferior parietal cortex (BA 40), dorsolateral prefrontal cortex (BA 9/46), and dorsal frontal cortex (BA 6) exhibited right lateralized activation during both innocuous and painful stimulation, regardless of the side of stimulation. Thus components of information arising from the body surface are processed, in part, by right lateralized systems analogous to those that process auditory and visual spatial information arising from extrapersonal space. Such right lateralized processing can account for the left somatosensory neglect arising from injury to brain regions within the right cerebral hemisphere.

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Otto, Michael W., and Ronald A. Yeo. "Hemispheric Activation, Affective Judgments, and Pain Perception." Psychotherapy and Psychosomatics 60, no. 3-4 (1993): 186–94. http://dx.doi.org/10.1159/000288692.

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Converse, Patrick D., Jaya Pathak, Elizabeth Steinhauser, and Erin Whitford Homan. "Repeated Self-Regulation and Asymmetric Hemispheric Activation." Basic and Applied Social Psychology 34, no. 2 (March 2012): 152–67. http://dx.doi.org/10.1080/01973533.2012.655989.

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Michelogiannis, Sifis, Nikos Paritsis, and Panayotis Trikas. "EEG coherence during hemispheric activation in schizophrenics." European Archives of Psychiatry and Clinical Neuroscience 241, no. 1 (July 1991): 31–34. http://dx.doi.org/10.1007/bf02193751.

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Hund-Georgiadis, Margret, Stefan Zysset, Kathrin Weih, Thomas Guthke, and D. Yves von Cramon. "Crossed Nonaphasia in a Dextral With Left Hemispheric Lesions." Stroke 32, no. 11 (November 2001): 2703–7. http://dx.doi.org/10.1161/str.32.11.2703.

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Background — General conclusions concerning mechanisms of cerebral lateralization may be learned from the investigation of functional brain organization in patients with anomalous lateralization. Case Description — The functional organization of language, attention, and motor performance was investigated in a 42-year-old patient with crossed nonaphasia by means of functional MRI. The strongly right-handed man experienced a left middle cerebral artery infarction documented by MRI without exhibition of aphasia. However, the left hemispheric stroke was accompanied by visuospatial impairment, right-sided slight sensory and motor paresis, and right homonymous hemianopia. No history of familial sinistrality or prior neurological illness was present. Functional MR language mapping revealed strong right hemispheric activation in inferior frontal and superior temporal cortices. Finger tapping with the right hand recruited ipsilateral premotor and motor areas as well as supplementary motor cortex. A Stroop task, usually strongly associated with left-sided inferior frontal activation in dextrals, resulted in strong right hemispheric frontal activation. Conclusions — From our data there is clear evidence that different modalities, such as language perception and production, attention, and motor performance, are processed exclusively by 1 hemisphere when atypical cerebral dominance is present.

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Davidson, Richard J. "Emotion and Affective Style: Hemispheric Substrates." Psychological Science 3, no. 1 (January 1992): 39–43. http://dx.doi.org/10.1111/j.1467-9280.1992.tb00254.x.

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Research on cerebral asymmetry and the experience and expression of emotion is reviewed. The studies described use electrophysiological procedures to make inferences about patterns of regional cortical activation. Such procedures have sufficient temporal resolution to be used in the study of brief emotional experiences denoted by spontaneous facial expressions. In adults and infants, the experimental arousal of positive, approach-related emotions is associated with selective activation of the left frontal region, while arousal of negative, withdrawal-related emotions is associated with selective activation of the right frontal region. Individual differences in baseline measures of frontal asymmetry are associated with dispositional mood, affective reactivity, temperament, and immune function. These studies suggest that neural systems mediating approach- and withdrawal-related emotion and action are, in part, represented in the left and right frontal regions, respectively, and that individual differences in the activation levels of these systems are associated with a coherent nomological network of associations which constitute a person's affective style.

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Pugnaghi, Giulia, Robert Schnuerch, Henning Gibbons, Daniel Memmert, and Carina Kreitz. "The Other End of the Line." Swiss Journal of Psychology 79, no. 1 (January 2020): 5–14. http://dx.doi.org/10.1024/1421-0185/a000231.

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Abstract. The two hemispheres of the human brain are asymmetrically involved in representing a person’s motivational orientation: Approach motivation is reflected in greater activation of the left hemisphere, whereas avoidance motivation more strongly activates the right hemisphere. Visuospatial bias, as assessed in the line-bisection task, is often used as a simple behavioral measure of relative hemispheric activation. In three experiments, we investigated whether affect-induced approach and avoidance motivation are associated with spatial biases in line-bisection performance. Happy or terrifying pictures (Experiment 1, N = 70), happy or sad music (Experiment 2, N = 50), and joyful or frightening videos (Experiment 3, N = 90) were used to induce negative and positive affect. Mood-induction procedures successfully changed emotional states in the intended direction. However, our analyses revealed no effect of mood on visuospatial biases in the line-bisection task. Additional Bayesian analyses also provided more evidence against the hypothesized effect than in favor of it. Thus, visuospatial bias in line bisection does not seem to be a sensitive measure of approach and avoidance motivation induced by positive and negative affect.

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Ravi Kumar, A., and Parameswara Achutha Kurup. "Hypothalamic digoxin, hemispheric chemical dominance and sarcoidosis." Acta Neuropsychiatrica 16, no. 3 (June 2004): 160–68. http://dx.doi.org/10.1111/j.0924-2708.2004.00072.x.

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Background/aims:The isoprenoid pathway produces three key metabolites: endogenous digoxin (membrane sodium-potassium ATPase inhibitor, immunomodulator and regulator of neurotransmitter/amino acid transport), dolichol (regulates N-glycosylation of proteins) and ubiquinone (free radical scavenger). The role of the isoprenoid pathway in the pathogenesis of sarcoidosis in relation to hemispheric dominance was studied.Methods:The isoprenoid pathway-related cascade was assessed in patients with systemic sarcoidosis with pulmonary involvement. The pathway was also assessed in patients with right hemispheric, left hemispheric and bihemispheric dominance for comparison to find out the role of hemispheric dominance in the pathogenesis of sarcoidosis.Results:In patients with sarcoidosis there was elevated digoxin synthesis, increased dolichol and glycoconjugate levels and low ubiquinone and elevated free radical levels. There was also an increase in tryptophan catabolites and a reduction in tyrosine catabolites. There was an increase in the cholesterol:phospholipid ratio and a reduction in the glycoconjugate level of red blood cell (RBC) membrane in this group of patients. The same biochemical patterns were obtained in individuals with right hemispheric dominance. In individuals with left hemispheric dominance the patterns were reversed.Conclusions:Endogenous digoxin, by activating the calcineurin signal transduction pathway of T cells, can contribute to immune activation in sarcoidosis. An altered glycoconjugate metabolism can lead to the generation of endogenous self-glycoprotein antigens in the lung as well as other tissues. Increased free radical generation can also lead to immune activation. The role of a dysfunctional isoprenoid pathway and endogenous digoxin in the pathogenesis of sarcoidosis in relation to right hemispheric chemical dominance is discussed. All the patients with sarcoidosis were right-handed/left hemispheric dominant according to the dichotic listening test, but their biochemical patterns were suggestive of right hemispheric chemical dominance. Hemispheric chemical dominance has no correlation with handedness or the dichotic listening test.

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Panerai, Ronney B., Michelle Moody, Penelope J. Eames, and John F. Potter. "Dynamic cerebral autoregulation during brain activation paradigms." American Journal of Physiology-Heart and Circulatory Physiology 289, no. 3 (September 2005): H1202—H1208. http://dx.doi.org/10.1152/ajpheart.00115.2005.

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Dynamic cerebral autoregulation (CA) describes the transient response of cerebral blood flow (CBF) to rapid changes in arterial blood pressure (ABP). We tested the hypothesis that the efficiency of dynamic CA is increased by brain activation paradigms designed to induce hemispheric lateralization. CBF velocity [CBFV; bilateral, middle cerebral artery (MCA)], ABP, ECG, and end-tidal Pco2 were continuously recorded in 14 right-handed healthy subjects (21–43 yr of age), in the seated position, at rest and during 10 repeated presentations (30 s on-off) of a word generation test and a constructional puzzle. Nonstationarities were not found during rest or activation. Transfer function analysis of the ABP-CBFV (i.e., input-output) relation was performed for the 10 separate 51.2-s segments of data during activation and compared with baseline data. During activation, the coherence function below 0.05 Hz was significantly increased for the right MCA recordings for the puzzle tasks compared with baseline values (0.36 ± 0.16 vs. 0.26 ± 0.13, P < 0.05) and for the left MCA recordings for the word paradigm (0.48 ± 0.23 vs. 0.29 ± 0.16, P < 0.05). In the same frequency range, significant increases in gain were observed during the puzzle paradigm for the right (0.69 ± 0.37 vs. 0.46 ± 0.32 cm·s−1·mmHg−1, P < 0.05) and left (0.61 ± 0.29 vs. 0.45 ± 0.24 cm·s−1·mmHg−1, P < 0.05) hemispheres and during the word tasks for the left hemisphere (0.66 ± 0.31 vs. 0.39 ± 0.15 cm·s−1·mmHg−1, P < 0.01). Significant reductions in phase were observed during activation with the puzzle task for the right (−0.04 ± 1.01 vs. 0.80 ± 0.86 rad, P < 0.01) and left (0.11 ± 0.81 vs. 0.57 ± 0.51 rad, P < 0.05) hemispheres and with the word paradigm for the right hemisphere (0.05 ± 0.87 vs. 0.64 ± 0.59 rad, P < 0.05). Brain activation also led to changes in the temporal pattern of the CBFV step response. We conclude that transfer function analysis suggests important changes in dynamic CA during mental activation tasks.

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Moeck, Ella K., Nicole A. Thomas, and Melanie K. T. Takarangi. "Right Hemisphere Memory Bias Does Not Extend to Involuntary Memories for Negative Scenes." Perception 50, no. 1 (January 2021): 27–38. http://dx.doi.org/10.1177/0301006620982210.

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Attention is unequally distributed across the visual field. Due to greater right than left hemisphere activation for visuospatial attention, people attend slightly more to the left than the right side. As a result, people voluntarily remember visual stimuli better when it first appears in the left than the right visual field. But does this effect—termed a right hemisphere memory bias—also enhance involuntary memory? We manipulated the presentation location of 100 highly negative images (chosen to increase the likelihood that participants would experience any involuntary memories) in three conditions: predominantly leftward (right hemisphere bias), predominantly rightward (left hemisphere bias), or equally in both visual fields (bilateral). We measured subsequent involuntary memories immediately and for 3 days after encoding. Contrary to predictions, biased hemispheric processing did not affect short- or long-term involuntary memory frequency or duration. Future research should measure hemispheric differences at retrieval, rather than just encoding.

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Milivojevic, Branka, Jeff P. Hamm, and Michael C. Corballis. "Functional Neuroanatomy of Mental Rotation." Journal of Cognitive Neuroscience 21, no. 5 (May 2009): 945–59. http://dx.doi.org/10.1162/jocn.2009.21085.

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Brain regions involved in mental rotation were determined by assessing increases in fMRI activation associated with increases in stimulus rotation during a mirror-normal parity-judgment task with letters and digits. A letter–digit category judgment task was used as a control for orientation-dependent neural processing unrelated to mental rotation per se. Compared to the category judgments, the parity judgments elicited increases in activation in both the dorsal and the ventral visual streams, as well as higher-order premotor areas, inferior frontal gyrus, and anterior insula. Only a subset of these areas, namely, the posterior part of the dorsal intraparietal sulcus, higher-order premotor regions, and the anterior insula showed increased activation as a function of stimulus orientation. Parity judgments elicited greater activation in the right than in the left ventral intraparietal sulcus, but there were no hemispheric differences in orientation-dependent activation, suggesting that neither hemisphere is dominant for mental rotation per se. Hemispheric asymmetries associated with parity-judgment tasks may reflect visuospatial processing other than mental rotation itself, which is subserved by a bilateral fronto-parietal network, rather than regions restricted to the posterior parietal.

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Lin, K. c. "Right-Hemispheric Activation Approaches to Neglect Rehabilitation Poststroke." American Journal of Occupational Therapy 50, no. 7 (July 1, 1996): 504–15. http://dx.doi.org/10.5014/ajot.50.7.504.

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van Ettinger-Veenstra, H. M., M. Ragnehed, M. Hällgren, T. Karlsson, A. M. Landtblom, P. Lundberg, and M. Engström. "Right-hemispheric brain activation correlates to language performance." NeuroImage 49, no. 4 (February 2010): 3481–88. http://dx.doi.org/10.1016/j.neuroimage.2009.10.041.

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Shapiro, David M., W. David Crews, David W. Harrison, and D. Erik Evirhart. "Age Differences in Hemispheric Activation to Sensory Condition." International Journal of Neuroscience 87, no. 3-4 (January 1996): 249–56. http://dx.doi.org/10.3109/00207459609070843.

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Laeng, B., H. A. Buchtel, and C. M. Butter. "Tactile rod bisection: Hemispheric activation and sex differences." Neuropsychologia 34, no. 11 (November 1996): 1115–21. http://dx.doi.org/10.1016/0028-3932(96)00025-5.

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32

Behne, Nicole, Beate Wendt, Henning Scheich, and André Brechmann. "Contralateral White Noise Selectively Changes Left Human Auditory Cortex Activity in a Lexical Decision Task." Journal of Neurophysiology 95, no. 4 (April 2006): 2630–37. http://dx.doi.org/10.1152/jn.01201.2005.

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In a previous study, we hypothesized that the approach of presenting information-bearing stimuli to one ear and noise to the other ear may be a general strategy to determine hemispheric specialization in auditory cortex (AC). In that study, we confirmed the dominant role of the right AC in directional categorization of frequency modulations by showing that fMRI activation of right but not left AC was sharply emphasized when masking noise was presented to the contralateral ear. Here, we tested this hypothesis using a lexical decision task supposed to be mainly processed in the left hemisphere. Subjects had to distinguish between pseudowords and natural words presented monaurally to the left or right ear either with or without white noise to the other ear. According to our hypothesis, we expected a strong effect of contralateral noise on fMRI activity in left AC. For the control conditions without noise, we found that activation in both auditory cortices was stronger on contralateral than on ipsilateral word stimulation consistent with a more influential contralateral than ipsilateral auditory pathway. Additional presentation of contralateral noise did not significantly change activation in right AC, whereas it led to a significant increase of activation in left AC compared with the condition without noise. This is consistent with a left hemispheric specialization for lexical decisions. Thus our results support the hypothesis that activation by ipsilateral information-bearing stimuli is upregulated mainly in the hemisphere specialized for a given task when noise is presented to the more influential contralateral ear.

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Greenwald, Ralf R., and James Jerger. "Neuroelectric Correlates of Hemispheric Asymmetry: Spectral Discrimination and Stimulus Competition." Journal of the American Academy of Audiology 14, no. 08 (September 2003): 434–43. http://dx.doi.org/10.1055/s-0040-1715934.

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In an effort to explore further the role of the right hemisphere in auditory processing, this study utilized brain event-related potentials (ERPs) to investigate hemispheric asymmetry for the processing of complex spectral tones. Subjects participated in two pitch discrimination tasks, one diotic, the other dichotic. ERP components were recorded from 28 electrodes on the scalp and analyzed via individual/group average area measurements. Results showed that ERPs recorded in response to the dichotic target pairs exhibited a larger P3 area when the target tone was presented to the left ear, while the N1 area showed no significant difference. ERPs recorded in the diotic condition showed a larger P3 area and smaller N1 area compared to the dichotic conditions. Finally, all experimental tasks showed that topographic hemispheric activation patterns were asymmetric to the right hemisphere. Findings support the notion that ERP topographic asymmetries may be dependent on specific cognitive task demands (e.g., diotic vs. dichotic modes of presentation). In addition, the data suggest that the P3 component may better reflect interaural advantages for complex tones than the N1 component and may, therefore, be a more sensitive indicator of hemispheric specialization.

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Murray, Elizabeth, Janet Brenya, Katherine Chavarria, Karen J. Kelly, Anjel Fierst, Nathira Ahmad, Caroline Anton, et al. "Corticospinal Excitability during a Perspective Taking Task as Measured by TMS-Induced Motor Evoked Potentials." Brain Sciences 11, no. 4 (April 18, 2021): 513. http://dx.doi.org/10.3390/brainsci11040513.

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Only by understanding the ability to take a third-person perspective can we begin to elucidate the neural processes responsible for one’s inimitable conscious experience. The current study examined differences in hemispheric laterality during a first-person perspective (1PP) and third-person perspective (3PP) taking task, using transcranial magnetic stimulation (TMS). Participants were asked to take either the 1PP or 3PP when identifying the number of spheres in a virtual scene. During this task, single-pulse TMS was delivered to the motor cortex of both the left and right hemispheres of 10 healthy volunteers. Measures of TMS-induced motor-evoked potentials (MEPs) of the contralateral abductor pollicis brevis (APB) were employed as an indicator of lateralized cortical activation. The data suggest that the right hemisphere is more important in discriminating between 1PP and 3PP. These data add a novel method for determining perspective taking and add to the literature supporting the role of the right hemisphere in meta representation.

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Moncrieff, Deborah, Roderick W. McColl, and Jeffrey R. Black. "Hemodynamic Differences in Children with Dichotic Listening Deficits: Preliminary Results from an fMRI Study during a Cued Listening Task." Journal of the American Academy of Audiology 19, no. 01 (January 2008): 033–45. http://dx.doi.org/10.3766/jaaa.19.1.4.

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Functional magnetic resonance images were acquired while children with and without dyslexia identified incongruous words embedded within fairy tale segments in a quasidichotic listening task. All children produced greater activation in the left hemisphere than in the right hemisphere during the binaural separation listening task. Children with dyslexia, who had a higher incidence of a dichotic left ear deficit from prescanning behavioral tests, produced fewer hits and more misses than control children while monitoring their left ears in the scanner. Control children produced stronger left hemispheric activation for ipsilateral left ear input than right hemispheric activation for ipsilateral right ear input, but ipsilateral activation patterns in children with dyslexia were symmetrical. Children with dyslexia who monitored their right ears first produced the lowest left hemispheric activation overall, suggesting that priming of the right ear may have inhibited the ability of children with a left ear deficit to adequately identify target words presented toward their left ears while in the scanner. Se registraron imágenes de resonancia magnética funcional mientras niños con sin dislexia identificaban palabras incongruentes inmersas en segmentos de un cuento de hadas, durante una tarea de escucha cuasi-dicótica. Todos los niños produjeron una mayor activación en el hemisferio izquierdo que en el derecho durante dicha tarea de separación auditiva binaural. Los niños con dislexia, quienes mostraban una mayor incidencia de deficiencia dicótica en el oído izquierdo demostrada por pruebas conductuales previas al escaneo, lograron menores aciertos y más fallas que los niños del grupo control, mientras se monitoreaban sus oídos izquierdos en el equipo. Los niños controles produjeron una activación más fuerte del hemisferio izquierdo para la estimulación ipsilateral del oído izquierdo que activación del hemisferio derecho para la estimulación ipsilateral del oído derecho, pero los patrones de activación ipsilateral en los niños de dislexia fueron simétricos. Los niños con dislexia que monitorearon primero sus oídos derechos produjeron la activación global más baja del hemisferio izquierdo, sugiriendo que poner atención al oído derecho puede haber inhibido la capacidad de los niños con una deficiencia del oído izquierdo para identificar adecuadamente palabras clave presentadas hacia el oído izquierdo mientras eran escaneados.

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TenHouten, Warren D. "Application of Dual Brain Theory to Cross-Cultural Studies of Cognitive Development and Education." Sociological Perspectives 32, no. 2 (June 1989): 153–67. http://dx.doi.org/10.2307/1389094.

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The cognitive structures of children from minority group, poor, rural, aboriginal, or otherwise socially disadvantaged backgrounds are hypothesized to be gestalt-synthetic in mode of thought and field-dependent in cognitive style; cognitive structures of children from dominant, majority, urban, nonaboriginal, or otherwise advantaged backgrounds, to be relatively logical-analytic and field-independent. These cognitive structures are shown by cerebral lateralization theory to have neurophysiological substrates. Individual hemisphericity, the tendency to rely on the resources of the right or left cerebral hemisphere, is interpreted on four distinct levels: performance hemisphericity, hemispheric activation, hemispheric preference (as personality structure), and cognitive style (lateral flexibility). An illustrative comparison of thinking processes of Australian Aborigines and Australian-born whites is developed using primary and secondary data.

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Hirao, Takahiro, and Hiroaki Masaki. "Effects of Unilateral Hand Contraction on The Persistence of Hemispheric Asymmetry of Cortical Activity." Journal of Psychophysiology 33, no. 2 (April 1, 2019): 119–26. http://dx.doi.org/10.1027/0269-8803/a000215.

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Abstract. Athletes who squeezed a ball with their left hand immediately prior to execution of sports activities did not show performance deterioration under severe pressure ( Beckmann, Gröpel, & Ehrlenspiel, 2013 ). This result has been explained by priming of the dominant right hemisphere. However, it remains unclear what variables have the greatest effect on asymmetrical brain activity (e.g., duration and strength of ball squeezing). We hypothesized that squeezing a ball harder for a longer period might lead to stronger asymmetrical activity because motor-related areas would have increased activation due to the more forceful movement. We used electroencephalograms (EEGs) to investigate the hemispheric asymmetry of brain activity produced by squeezing a ball with a unilateral hand. EEGs were assessed during a baseline period as well as in eight experimental conditions wherein the strength and duration of the ball squeeze were manipulated. Our results showed that right-hemispheric-dominant brain activation was maximized when participants squeezed with their left hand a ball that had an internal pressure of 100 hPa for 90 s or 20 hPa for 30 s. Moreover, squeezing the ball with 100 hPa internal pressure for 90 s created a prominent interhemispheric asymmetry of cortical activity. We suspect that squeezing a ball strongly for a long period might be helpful in dealing with “choking” under pressure by producing greater right-hemispheric activation. This result could help improve simple methods for competitive athletes to reduce the likelihood of exhibiting choking behavior that could be practiced with minimal effort, even during short breaks during a game.

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Kato, Kimiko, and Tsunetaka Okita. "Hemispheric difference in the time course of semantic activation:." Japanese journal of psychology 81, no. 3 (2010): 226–33. http://dx.doi.org/10.4992/jjpsy.81.226.

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Koivisto, Mika, and Matti Laine. "Hemispheric Asymmetries in Activation and Integration of Categorical Information." Laterality: Asymmetries of Body, Brain and Cognition 5, no. 1 (January 2000): 1–21. http://dx.doi.org/10.1080/713754358.

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Koivisto, Mika, and Matti Laine. "Hemispheric Asymmetries in Activation and Integration of Categorical Information." Laterality 5, no. 1 (January 1, 2000): 1–21. http://dx.doi.org/10.1080/135765000396799.

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41

Cherbuin, Nicolas, and Cobie Brinkman. "Hemispheric activation and interaction: Past activity affects future performance." Laterality: Asymmetries of Body, Brain and Cognition 10, no. 6 (November 2005): 563–79. http://dx.doi.org/10.1080/13576500442000319.

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Poduri, Annapurna, Gilad D. Evrony, Xuyu Cai, Princess Christina Elhosary, Rameen Beroukhim, Maria K. Lehtinen, L. Benjamin Hills, et al. "Somatic Activation of AKT3 Causes Hemispheric Developmental Brain Malformations." Neuron 74, no. 1 (April 2012): 41–48. http://dx.doi.org/10.1016/j.neuron.2012.03.010.

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43

Hollander, Eric, Jose L. Carrasco, Linda S. Mullen, Sari Trungold, Concetta M. DeCaria, and James Towey. "Left hemispheric activation in depersonalization disorder: A case report." Biological Psychiatry 31, no. 11 (June 1992): 1157–62. http://dx.doi.org/10.1016/0006-3223(92)90161-r.

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Peck, Kyung K., Michelle Bradbury, Nicole Petrovich, Bob L. Hou, Nicole Ishill, Cameron Brennan, Viviane Tabar, and Andrei I. Holodny. "PRESURGICAL EVALUATION OF LANGUAGE USING FUNCTIONAL MAGNETIC RESONANCE IMAGING IN BRAIN TUMOR PATIENTS WITH PREVIOUS SURGERY." Neurosurgery 64, no. 4 (April 1, 2009): 644–53. http://dx.doi.org/10.1227/01.neu.0000339122.01957.0a.

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Abstract OBJECTIVE Functional magnetic resonance imaging (fMRI) is used to assess language laterality in preoperative brain tumor patients. In postsurgical patients, susceptibility artifacts can potentially alter ipsilateral fMRI activation volumes and the assessment of language laterality. The purpose of this study was to investigate the ability of fMRI to correctly measure language dominance in brain tumor patients with previous surgery because this patient cohort is vulnerable to type II statistical errors and subsequent misjudgment of laterality. METHODS Twenty-six right-handed patients with left-hemisphere gliomas (16 with and 10 without previous surgery) underwent preoperative language fMRI. Language laterality was measured using hemispheric and Broca's area regions of interest (ROIs). Hemisphere dominance, as established by laterality measurements, was compared with that determined by intraoperative electrocorticography and behavioral assessments. RESULTS Localization of primary language cortices was achieved in 24 of 26 patients studied. The hemisphere dominance evaluated by fMRI was verified by intraoperative corticography in only 14 patients (10 with and 4 without previous surgery), and only 12 of them had complete neuropsychological testing. Complete concordance of the laterality with intraoperative electrocorticography and behavioral assessments was found in patients without previous surgery. In patients with previous surgery, concordance was 75% using Broca's area ROI and 88% using hemispheric ROI, notwithstanding susceptibility artifacts. Differences in laterality between pre- and postsurgical patients, based on either hemispheric (P = 0.81) or Broca's area (P = 0.19) ROI measurements were not statistically significant. However, hemispheric ROI analyses were found to be less affected by postsurgical artifacts and may be more suitable for establishing hemisphere dominance. CONCLUSION fMRI mapping of eloquent language cortices in brain tumor patients after surgery is feasible and can serve as a useful baseline evaluation for preoperative neurosurgical planning. However, findings should be interpreted with caution in the presence of postsurgical artifacts.

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Graham, Norris A., and John R. Kershner. "Reading Styles in Children with Dyslexia: A Neuropsychological Evaluation of Modality Preference on the Reading Style Inventory." Learning Disability Quarterly 19, no. 4 (November 1996): 233–40. http://dx.doi.org/10.2307/1511209.

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This study assessed the neuropsychological validity of the modality preference measures from the Reading Style Inventory (RSI), an instrument that claims to measure left-hemisphere (analytic, sequential, auditory) and right-hemisphere (holistic, simultaneous, visual) reading styles. Older fluent readers (age-matched to the children with disabilities) rated their reading styles more strongly auditory and visual than nondisabled beginning readers (reading-level-matched to the children with disabilities) and children with dyslexia. Compared to both control groups, the dyslexia group was unique in failing to demonstrate a high incidence of children with strong preferences in either modality. RSI ratings were unrelated to dichotic listening and, by inference, not related to the relative activation of the cerebral hemispheres in linguistic processing. RSI performance was also unrelated to reading comprehension, word recognition, word attack, and verbal/performance IQ. The results do not support the underlying biological rationale of the RSI or its claims to accurately profile nondisabled novice readers and children with dyslexia in terms of their cerebral hemispheric preferences. However, the results do suggest the potential usefulness of the RSI in educational contexts.

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Levick, Stephen E., Bruce E. Wexler, Tyler Lorig, Raquel E. Gur, Ruben C. Gur, and Gary E. Schwartz. "Asymmetrical Visual Deprivation: A Technique to Differentially Influence Lateral Hemispheric Function." Perceptual and Motor Skills 76, no. 3_suppl (June 1993): 1363–82. http://dx.doi.org/10.2466/pms.1993.76.3c.1363.

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This article describes a contact-lens method to sustain asymmetry in visual deprivation and the use of this method to test the general hypothesis that asymmetry in input deprivation can shift activation balance in the integrated brain, differentially influencing lateral hemispheric function. Effects of asymmetrical visual deprivation were as predicted on lateral asymmetry of EEG theta, producing more theta over the deprived hemisphere. Cross-modal influence of such visual deprivation was found in the perception of pleasantness of odors. An interaction was found between side of visual deprivation and performance on verbal reasoning and spatial orientation tasks. A line-bisection test of visual attention was not sensitive to the effects. Fatigue as rated on the Profile of Mood States was greatest when the left hemisphere was deprived.

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Williamson, John B., Aidan Murphy, Damon G. Lamb, Zared Schwartz, Dana Szeles, Michal Harciarek, Aleksandra Mańkowska, and Kenneth M. Heilman. "Improved Accuracy on Lateralized Spatial Judgments in Healthy Aging." Journal of the International Neuropsychological Society 25, no. 10 (September 23, 2019): 1044–50. http://dx.doi.org/10.1017/s1355617719000900.

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AbstractObjectives:Healthy young adults often demonstrate a leftward spatial bias called “pseudoneglect” which often diminishes with aging. One hypothesis for this phenomenon is an age-related deterioration in right hemisphere functions (right hemi-aging). If true, then a greater rightward bias should be evident on all spatial attention tasks regardless of content. Another hypothesis is a decrease in asymmetrical hemispheric activation with age (HAROLD). If true, older participants may show reduced bias in all spatial tasks, regardless of leftward or rightward biasing of specific spatial content.Methods:Seventy right-handed healthy participants, 33 younger (21–40) and 37 older (60–78), were asked to bisect solid and character-letter lines as well as to perform left and right trisections of solid lines.Results:Both groups deviated toward the left on solid line bisections and left trisections. Both groups deviated toward the right on right trisections and character line bisections. In all tasks, the older participants were more accurate than the younger participants.Conclusions:The finding that older participants were more accurate than younger participants across all bisection and trisection conditions suggests a decrease in the asymmetrical hemispheric activation of these specialized networks important in the allocation of contralateral spatial attention or spatial action intention.

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Persinger, M. A. "Right Hemisphericity, Low Self-Esteem, and Unusual Experiences: A Response to Vingiano." Perceptual and Motor Skills 75, no. 2 (October 1992): 568–70. http://dx.doi.org/10.2466/pms.1992.75.2.568.

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Vingiano's (1992) challenge concerning the relationship between right hemisphericity, low self-esteem, mystical experiences, and religiosity can be clarified by the concept of vectorial hemisphericity. Ontogenetic intrusions of right-hemispheric processes into the left hemispheric sense of self should be experienced most frequently as an apprehensive “presence” that results in lower self-esteem. Because transient above-normal left-hemispheric activity enhances positive affect and the sense of self, concurrent right-hemispheric intrusions are experienced as mystical experiences. Religiosity would be the consequence of persistent above-normal left-temporofrontal activation that encourages the delusion. Hence, extreme conditions, such as left lateralized temporal-lobe epileptic foci, encourage both mystical and religious experiences.

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Schiff, Bernard B., and Chris Bassel. "Effects of asymmetrical hemispheric activation on approach and withdrawal responses." Neuropsychology 10, no. 4 (1996): 557–64. http://dx.doi.org/10.1037/0894-4105.10.4.557.

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Nicholls, Michael E. R., John L. Bradshaw, and Jason B. Mattingley. "Unilateral hemispheric activation does not affect free-viewing perceptual asymmetries." Brain and Cognition 46, no. 1-2 (June 2001): 219–23. http://dx.doi.org/10.1016/s0278-2626(01)80070-1.

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Journal articles on the topic 'Hemispheric activation'

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