期刊
JOURNAL OF COGNITIVE NEUROSCIENCE
卷 19, 期 2, 页码 331-340出版社
M I T PRESS
DOI: 10.1162/jocn.2007.19.2.331
关键词
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We studied the correlation between perception and hemodynamic activity in the visual cortex in a change detection task. Whenever the observer percieved the location of a change, rightly or wrongly, the blood oxyganization level-dependent signal increased in the primary visual cortex and the nearby extrasriate areas above the caseline activity caused by the visual stimulation. This non-sensory-evoked activity was localized and corresponded to the percieved location of the change. When a change was missed, or when observers attended to a different task, the change failed to evoke such a response. The latency of the nonsensory component increased linearly with subjects' reaction time, with a slope of one, and its amplitude was independent of contrast. Control experiments are compatible with the hypothesis that the nonsensory hemodynamic signal is mediated by top-down spatial attention, linked to (but seperate from) awareness of the change.
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