The neural basis of centre-surround interactions in visual motion processing

Moutsiana, C., Field, D.T. and Harris, J.P. 2011. The neural basis of centre-surround interactions in visual motion processing. PLoS ONE. 6 (7), p. e22902. doi:10.1371/journal.pone.0022902

TitleThe neural basis of centre-surround interactions in visual motion processing
AuthorsMoutsiana, C., Field, D.T. and Harris, J.P.
Abstract

Perception of a moving visual stimulus can be suppressed or enhanced by surrounding context in adjacent parts of the visual field. We studied the neural processes underlying such contextual modulation with fMRI. We selected motion selective regions of interest (ROI) in the occipital and parietal lobes with sufficiently well defined topography to preclude direct activation by the surround. BOLD signal in the ROIs was suppressed when surround motion direction matched central stimulus direction, and increased when it was opposite. With the exception of hMT+/V5, inserting a gap between the stimulus and the surround abolished surround modulation. This dissociation between hMT+/V5 and other motion selective regions prompted us to ask whether motion perception is closely linked to processing in hMT+/V5, or reflects the net activity across all motion selective cortex. The motion aftereffect (MAE) provided a measure of motion perception, and the same stimulus configurations that were used in the fMRI experiments served as adapters. Using a linear model, we found that the MAE was predicted more accurately by the BOLD signal in hMT+/V5 than it was by the BOLD signal in other motion selective regions. However, a substantial improvement in prediction accuracy could be achieved by using the net activity across all motion selective cortex as a predictor, suggesting the overall conclusion that visual motion perception depends upon the integration of activity across different areas of visual cortex.

Article numbere22902
JournalPLoS ONE
Journal citation6 (7), p. e22902
ISSN1932-6203
Year2011
PublisherPublic Library of Science
Publisher's version
Digital Object Identifier (DOI)doi:10.1371/journal.pone.0022902
Publication dates
Published29 Jul 2011
LicenseCC BY 4.0

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