Title
Differential effect of visual motion adaptation upon visual cortical excitability
Author
Lubeck, A.J.A.
van Ombergen, A.
Ahmad, H.
Bos, J.E.
Wuyts, F.L.
Bronstein, A.
Arshad, Q.
Publication year
2017
Abstract
The objectives of this study were 1) to probe the effects of visual motion adaptation on early visual and V5/MT cortical excitability and 2) to investigate whether changes in cortical excitability following visual motion adaptation are related to the degree of visual dependency, i.e., an overreliance on visual cues compared with vestibular or proprioceptive cues. Participants were exposed to a roll motion visual stimulus before, during, and after visual motion adaptation. At these stages, 20 transcranial magnetic stimulation (TMS) pulses at phosphene threshold values were applied over early visual and V5/MT cortical areas from which the probability of eliciting a phosphene was calculated. Before and after adaptation, participants aligned the subjective visual vertical in front of the roll motion stimulus as a marker of visual dependency. During adaptation, early visual cortex excitability decreased whereas V5/MT excitability increased. After adaptation, both early visual and V5/MT excitability were increased. The roll motion-induced tilt of the subjective visual vertical (visual dependence) was not influenced by visual motion adaptation and did not correlate with phosphene threshold or visual cortex excitability. We conclude that early visual and V5/MT cortical excitability is differentially affected by visual motion adaptation. Furthermore, excitability in the early or late visual cortex is not associated with an increase in visual reliance during spatial orientation. Our findings complement earlier studies that have probed visual cortical excitability following motion adaptation and highlight the differential role of the early visual cortex and V5/MT in visual motion processing.
Subject
Human & Operational Modelling
PCS - Perceptual and Cognitive Systems
ELSS - Earth, Life and Social Sciences
Biology
Visual motion adaptation
Early visual cortex
V5/MT
Visual dependency
Cortical excitability
Transcranial magnetic stimulation
To reference this document use:
http://resolver.tudelft.nl/uuid:57887fc7-b5c0-4fc4-8a0a-181b15cbd9db
DOI
https://doi.org/10.1152/jn.00655.2016
TNO identifier
574771
Publisher
American Physiological Society
ISSN
0022-3077
Source
Journal of Neurophysiology, 117 (3), 903-909
Document type
article