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Vestibular activation differentially modulates human early visual cortex and V5/MT excitability and response entropy
Barry M Seemungal1, Jessica Guzman-Lopez, Qadeer Arshad
1Centre for Neurosciences, Charing Cross Campus, Imperial College London, London W6 8RF, UK. b.seemungal@imperial.ac.uk
Cerebral Cortex (New York, N.Y. : 1991)
|February 1, 2012
Summary
Vestibular activation specifically alters visual cortex excitability. This study shows distinct effects on early visual cortex (EVC) and V5/MT areas during head movement, impacting visual processing.
Area of Science:
- Neuroscience
- Visual System
- Vestibular System
Background:
- Head movements challenge the visual system to maintain acuity and distinguish self-motion from object-motion.
- While the vestibular-ocular reflex aids visual acuity during self-motion, higher-order visuovestibular mechanisms are also involved.
- A proposed cortical visuovestibular reciprocal antagonism suggests vestibular modulation of visual cortex excitability.
Purpose of the Study:
- To investigate the specific effects of vestibular activation on human visual cortex excitability.
- To differentiate between specific vestibular modulation and non-specific effects on cortical excitability.
Main Methods:
- Utilized transcranial magnetic stimulation (TMS)-induced phosphenes to probe visual cortex excitability.
- Measured changes in excitability in the early visual cortex (EVC) and V5/MT areas during vestibular activation.
- Employed information theory, specifically response entropy, to assess the specificity of vestibular effects.
Main Results:
- Observed decreased V5/MT excitability and increased EVC excitability during vestibular activation.
- Vestibular activation significantly modulated phosphene response entropy in V5/MT, but not in EVC.
- Information theory analysis distinguished specific vestibular modulation of V5/MT from non-specific effects at EVC.
Conclusions:
- This study provides the first demonstration of vestibular activation modulating human visual cortex excitability.
- Vestibular input specifically influences the excitability of the V5/MT visual area.
- Information theory is a valuable tool for distinguishing specific neural modulations from general arousal effects.
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