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Cerebral Cortex Advance Access originally published online on February 9, 2005
Cerebral Cortex 2005 15(11):1736-1741; 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

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

Juha Silvanto1,2, Nilli Lavie1,2 and Vincent Walsh1,2

1 Institute of Cognitive Neuroscience, University College London, 17 Queen Square, London WC1N 3AR, UK and 2 Department of Psychology, University College London, 26 Bedford Way, London WC1N 3AR, UK

Address correspondence to Juha Silvanto, Institute of Cognitive Neuroscience, University College London, 17 Queen Square, London WC1N 3AR, UK. Email: juha.silvanto{at}ucl.ac.uk

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.

Key Words: awareness • back-projections • motion detection • transcranial magnetic stimulation • V1 • V5/MT


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