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

2005; Oxford University Press; Volume: 15; Issue: 11 Linguagem: Inglês

10.1093/cercor/bhi050

1460-2199

Juha Silvanto, Nilli Lavie, Vincent Walsh,

Neural and Behavioral Psychology Studies

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.