10_Up_to_consciousness

The increase in the extent of recruitment of

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Unformatted text preview: t of extrastriate visual cortex and of activity in the DLPFC and sup. parietal cortex is associated with being conscious of the percepts; the subject reports awareness of these. Attention and awareness are category-specific (visual, auditive…) Visual attention is supported by activity in lateral intraparietal and frontal (eyefield) cortical areas. Auditory attention is supported by activity in inferior parietal and dorsolateral prefrontal cortex. Attention and awareness of visual percepts If attention is held, activity in the superior parietal and DLPFC is enhanced. This is graded with an increase in extrastriate visual cortex activity (peak at 200 ms, signals 1,2), until a threshold is reached (signal 3). At that time there is a sudden non-graded large increase in activity in DLPFC (signal 4) as well as in superior parietal cortex, which drives a very large late increase in extrastriate visual cortex. The increase in the extent of recruitment of extrastriate visual cortex and of activity in the DLPFC and sup. parietal cortex is associated with being conscious of the percepts; the subject reports awareness of these. Finally… Much of our behavior is initiated and directed by nonconscious processes (awareness is not always necessary) • Activation of superior parietal and dorsolateral prefrontal cortex are necessary for visual awareness, together with (of course) activation of a distributed set of regions for the different components of the visual scene in primary visual cortex and ventral visual areas. Auditory awareness requires activity in prefrontal and superior temporal cortex. • Conscious control is limited (it does not feel that way) L. Crevits, 2005 18...
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