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- W2056582806 abstract "A “late” period of activity in striate cortex (V1) in response to extrastriate feedback has been proposed to act as a marker of visual awareness. It is not clear, however, whether such recurrent activity is associated exclusively with aware perception or whether it is necessary also for unaware visual processing. We investigated the role of the “late” V1 activity in both aware and unaware visual motion perception. Participants were asked to make a forced-choice direction discrimination judgment on a coherently moving random-dot display and additionally rate their subjective awareness of the stimulus. Transcranial magnetic stimulation (TMS) was applied over the early visual cortex (V1/V2) either 20, 40, 60, 80, or 100 ms after motion offset. Visual awareness was impaired at an “early” (20 ms) and a “late” (60 ms) stimulation time window. Participants' forced-choice direction discrimination performance on “unaware” trials was above chance in No TMS baseline condition. Importantly, this performance was impaired by TMS over V1/V2 at the “late” time window. In a second experiment we show that the critical time window of V5/MT falls between the “early” and “late” time windows of V1/V2 activity. The results indicate that recurrent extrastriate-V1 activity is necessary for both aware and unaware perception." @default.
- W2056582806 created "2016-06-24" @default.
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- W2056582806 date "2010-06-01" @default.
- W2056582806 modified "2023-09-27" @default.
- W2056582806 title "The role of early visual cortex (V1/V2) in conscious and unconscious visual perception" @default.
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- W2056582806 doi "https://doi.org/10.1016/j.neuroimage.2010.02.042" @default.
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