scholarly journals Different EEG brain activity in right and left handers during visually induced self-motion perception

2020 ◽  
Vol 267 (S1) ◽  
pp. 79-90
Author(s):  
Michaela McAssey ◽  
James Dowsett ◽  
Valerie Kirsch ◽  
Thomas Brandt ◽  
Marianne Dieterich
Keyword(s):  
Motion Perception ◽  
Right Hemisphere ◽  
Coherent Motion ◽  
Roll Motion ◽  
Alpha Power ◽  
Time Frequency ◽  
Behavioural Characteristics ◽  
Visual Vestibular Interaction ◽  
Left And Right ◽  
Self Motion

AbstractVisually induced self-motion perception (vection) relies on visual–vestibular interaction. Imaging studies using vestibular stimulation have revealed a vestibular thalamo-cortical dominance in the right hemisphere in right handers and the left hemisphere in left handers. We investigated if the behavioural characteristics and neural correlates of vection differ between healthy left and right-handed individuals. 64-channel EEG was recorded while 25 right handers and 25 left handers were exposed to vection-compatible roll motion (coherent motion) and a matched, control condition (incoherent motion). Behavioural characteristics, i.e. vection presence, onset latency, duration and subjective strength, were also recorded. The behavioural characteristics of vection did not differ between left and right handers (all p > 0.05). Fast Fourier Transform (FFT) analysis revealed significant decreases in alpha power during vection–compatible roll motion (p < 0.05). The topography of this decrease was handedness-dependent, with left handers showing a left lateralized centro-parietal decrease and right handers showing a bilateral midline centro-parietal decrease. Further time–frequency analysis, time locked to vection onset, revealed a comparable decrease in alpha power around vection onset and a relative increase in alpha power during ongoing vection, for left and right handers. No effects were observed in theta and beta bands. Left and right-handed individuals show vection-related alpha power decreases at different topographical regions, possibly related to the influence of handedness-dependent vestibular dominance in the visual–vestibular interaction that facilitates visual self-motion perception. Despite this difference in where vection-related activity is observed, left and right handers demonstrate comparable perception and underlying alpha band changes during vection.

Alpha Oscillations Correlate with the Successful Inhibition of Unattended Stimuli

2011 ◽  
Vol 23 (9) ◽  
pp. 2494-2502 ◽  
Author(s):  
Barbara F. Händel ◽  
Thomas Haarmeier ◽  
Ole Jensen
Keyword(s):  
Visual System ◽  
Alpha Activity ◽  
Coherent Motion ◽  
Motion Processing ◽  
Alpha Power ◽  
Motion Direction ◽  
Alpha Oscillations ◽  
Visual Hemifield ◽  
Left And Right ◽  
Visual Hemifields

Because the human visual system is continually being bombarded with inputs, it is necessary to have effective mechanisms for filtering out irrelevant information. This is partly achieved by the allocation of attention, allowing the visual system to process relevant input while blocking out irrelevant input. What is the physiological substrate of attentional allocation? It has been proposed that alpha activity reflects functional inhibition. Here we asked if inhibition by alpha oscillations has behavioral consequences for suppressing the perception of unattended input. To this end, we investigated the influence of alpha activity on motion processing in two attentional conditions using magneto-encephalography. The visual stimuli used consisted of two random-dot kinematograms presented simultaneously to the left and right visual hemifields. Subjects were cued to covertly attend the left or right kinematogram. After 1.5 sec, a second cue tested whether subjects could report the direction of coherent motion in the attended (80%) or unattended hemifield (20%). Occipital alpha power was higher contralateral to the unattended side than to the attended side, thus suggesting inhibition of the unattended hemifield. Our key finding is that this alpha lateralization in the 20% invalidly cued trials did correlate with the perception of motion direction: Subjects with pronounced alpha lateralization were worse at detecting motion direction in the unattended hemifield. In contrast, lateralization did not correlate with visual discrimination in the attended visual hemifield. Our findings emphasize the suppressive nature of alpha oscillations and suggest that processing of inputs outside the field of attention is weakened by means of increased alpha activity.

scholarly journals Appetitive and aversive motivation in depression: The temporal dynamics of task-elicited asymmetries in alpha oscillations

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Simone Messerotti Benvenuti ◽  
Giulia Buodo ◽  
Rocco Mennella ◽  
Elisa Dal Bò ◽  
Daniela Palomba
Keyword(s):  
Right Hemisphere ◽  
Temporal Dynamics ◽  
Alpha Power ◽  
Specific Measure ◽  
Time Frequency ◽  
Passive Viewing ◽  
The Difference ◽  
Emotional Pictures ◽  
The Right ◽  
Aversive Motivation

AbstractThe capability model of alpha asymmetries posits that state emotional manipulations are a more powerful detector of depression-related motivational deficits than alpha activity at rest. The present study used a time-frequency approach to investigate the temporal dynamics of event-related changes in alpha power during passive viewing of emotional pictures in individuals with dysphoria (n = 23) and in individuals without dysphoria (n = 24). In the whole group, the processing of pleasant and unpleasant compared to neutral pictures was associated with a decrease in event-related alpha power (i.e., alpha desynchronization) at centro-parietal and parietal scalp sites in the 538–1400 ms post-stimulus. The group with dysphoria revealed a smaller alpha desynchronization than the group without dysphoria in response to pleasant, but not neutral and unpleasant, stimuli at frontal, fronto-central and centro-parietal sites. Interestingly, at central and centro-parietal scalp sites, the difference between groups in response to pleasant stimuli was lateralized to the right hemisphere, whereas no clear lateralization was observed at frontal and fronto-central scalp sites. These findings suggest that decreased cortical activity (i.e., reduced alpha desynchronization) in a network involving bilateral frontal and right-lateralized parietal regions may provide a specific measure of deficits in approach-related motivation in depression.

scholarly journals Modulation of alpha waves in sensorimotor cortical networks during self-motion perception evoked by different visual-vestibular conflicts

2020 ◽  
Vol 123 (1) ◽  
pp. 346-355 ◽  
Author(s):  
Sylvain Harquel ◽  
Michel Guerraz ◽  
Pierre-Alain Barraud ◽  
Corinne Cian
Keyword(s):  
Visual Motion ◽  
Neural Correlates ◽  
Alpha Activity ◽  
Line Of Sight ◽  
Roll Motion ◽  
Main Question ◽  
Visual Vestibular Interaction ◽  
Self Motion ◽  
First Time ◽  
Electroencephalogram Eeg

Visually induced illusion of self-motion (vection) has been used as a tool to address neural correlates of visual-vestibular interaction. The extent to which vestibular cortical areas are deactivated during vection varies from one study to another. The main question in this study is whether such deactivation depends on the visual-vestibular conflict induced by visual motion. A visual motion about the line of sight (roll motion) induces a visual-canal conflict in upright and supine observers. An additional visual-otolith conflict arises in the upright position only, with the graviceptive inputs indicating that the head is stationary. A 96-channel electroencephalogram (EEG) was recorded in 21 participants exposed to roll motion in seated and supine positions. Meanwhile, perceptual state of self-motion was recorded. Results showed a transient decrease in the cortical sensorimotor networks’ alpha activity at the onset of vection whatever the participant’s position, and therefore the visual-vestibular conflict. During vection, an increase in alpha activity over parieto-occipital areas was observed in the upright condition, that is, in a condition of visual-otolith conflict. The modulation of alpha activity may be predictive of the illusion of self-motion but also may reflect the level of inhibition in the sensorimotor networks needed to reduce potential interference from vestibular conflicting inputs. NEW & NOTEWORTHY For the first time, we explored the neural correlates of different visuo-vestibular conflicts induced by visual motion using EEG. Our study highlighted a neuronal signature for illusory self-motion (vection) in the sensorimotor networks. Strong alpha activity may predict successful vection but also reflects the level of inhibition of sensorimotor networks needed to reduce potential interfering vestibular inputs. These findings would be of prime importance for simulator and virtual reality systems that induce vection.

Color effects on self-motion perception

2006 ◽  
Author(s):  
Frederick Bonato ◽  
Andrea Bubka
Keyword(s):  
Motion Perception ◽  
Self Motion

Differentiation Between Left and Right Hemisphere Forms of Intelligence

2006 ◽  
Author(s):  
Cristina Isaacs ◽  
Nichole McWhorter ◽  
Teri McHale ◽  
Lorrie N. Shiota ◽  
Henry V. Soper
Keyword(s):  
Right Hemisphere ◽  
Left And Right

Disruption of self-motion perception without vestibular reflex alteration in ménière’s disease

2021 ◽  
pp. 1-11
Author(s):  
Mario Faralli ◽  
Michele Ori ◽  
Giampietro Ricci ◽  
Mauro Roscini ◽  
Roberto Panichi ◽  
...  
Keyword(s):  
Motion Perception ◽  
Meniere’S Disease ◽  
Menière’S Disease ◽  
Whole Body ◽  
Meniere's Disease ◽  
Ménière’S Disease ◽  
Menière's Disease ◽  
Ocular Reflex ◽  
Ménière's Disease ◽  
Self Motion

BACKGROUND: Self-motion misperception has been observed in vestibular patients during asymmetric body oscillations. This misperception is correlated with the patient’s vestibular discomfort. OBJECTIVE: To investigate whether or not self-motion misperception persists in post-ictal patients with Ménière’s disease (MD). METHODS: Twenty-eight MD patients were investigated while in the post-ictal interval. Self-motion perception was studied by examining the displacement of a memorized visual target after sequences of opposite directed fast-slow asymmetric whole body rotations in the dark. The difference in target representation was analyzed and correlated with the Dizziness Handicap Inventory (DHI) score. The vestibulo-ocular reflex (VOR) and clinical tests for ocular reflex were also evaluated. RESULTS: All MD patients showed a noticeable difference in target representation after asymmetric rotation depending on the direction of the fast/slow rotations. This side difference suggests disruption of motion perception. The DHI score was correlated with the amount of motion misperception. In contrast, VOR and clinical trials were altered in only half of these patients. CONCLUSIONS: Asymmetric rotation reveals disruption of self-motion perception in MD patients during the post-ictal interval, even in the absence of ocular reflex impairment. Motion misperception may cause persistent vestibular discomfort in these patients.

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