Journal
CEREBRAL CORTEX
Volume 19, Issue 7, Pages 1567-1582Publisher
OXFORD UNIV PRESS INC
DOI: 10.1093/cercor/bhn192
Keywords
apparent motion; electroencephalography; event-related potential; feedback; visual illusion
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Funding
- Federal Ministry of Education and Research [BMBF/DLR 01GO0203]
- Max Planck Society
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When 2 visual stimuli are presented one after another in different locations, they are often perceived as one, but moving object. Feedback from area human motion complex hMT/V5+ to V1 has been hypothesized to play an important role in this illusory perception of motion. We measured event-related responses to illusory motion stimuli of varying apparent motion (AM) content and retinal location using Electroencephalography. Detectable cortical stimulus processing started around 60-ms poststimulus in area V1. This component was insensitive to AM content and sequential stimulus presentation. Sensitivity to AM content was observed starting around 90 ms post the second stimulus of a sequence and most likely originated in area hMT/V5+. This AM sensitive response was insensitive to retinal stimulus position. The stimulus sequence related response started to be sensitive to retinal stimulus position at a longer latency of 110 ms. We interpret our findings as evidence for feedback from area hMT/V5+ or a related motion processing area to early visual cortices (V1, V2, V3).
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