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Cerebral Cortex Advance Access published online on February 9, 2005
Cerebral Cortex, doi:10.1093/cercor/bhi050
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© The Author 2005. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oupjournals.org

Article

Double Dissociation of V1 and V5/MT activity in Visual Awareness

Juha Silvanto 1*, Nilli Lavie 1, and Vincent Walsh 1

1 Institute of Cognitive Neuroscience, University College London, 17 Queen Square, London WC1N 3AR, UK; Department of Psychology, University College London, 26 Bedford Way, London WC1N 3AR, UK

* To whom correspondence should be addressed.
Juha Silvanto, E-mail: juha.silvanto{at}ucl.ac.uk


  Abstract

The critical time windows of the contribution of V1 and V5/MT to visual awareness of moving visual stimuli were compared by administering transcranial magnetic stimulation (TMS) to V1 or V5/MT in various time intervals from stimulus offset during performance of a simple motion detection task. Our results show a double dissociation in which the critical period of V1 both predates and postdates that of V5/MT, and where stimulation of either V1 at V5/MT's critical period or V5/MT at V1's critical period does not impair performance. These findings demonstrate the importance of back-projections from V5/MT to V1 in awareness of real motion stimuli.

Keywords: awareness; back-projections; motion detection; transcranial magnetic stimulation; V1; V5/MT.
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