Brain, Vol 120, Issue 3 535-559, Copyright © 1997 by Oxford University Press
P Stoerig and A Cowey
In man and monkey, absolute cortical blindness is caused by destruction of
the optic radiations and/or the primary visual cortex. It is characterized
by an absence of any conscious vision, but stimuli presented inside its
borders may nevertheless be processed. This unconscious vision includes
neuroendocrine, reflexive, indirect and forced-choice responses which are
mediated by the visual subsystems that escape the direct cerebral damage
and the Ensuring degeneration. While extrastriate cortical areas
participate in the mediation of the forced-choice responses, a concomitant
striate cortical activation does not seem to be necessary for blindsight.
Whether the loss of phenomenal vision is a necessary consequence of striate
cortical destruction and whether this structure is indispensable for
conscious sight are much debated questions which need to be tackled
experimentally.
REVIEWS
Blindsight in man and monkey
Institute of Medical Psychology, Ludwig-Maximilians-University, Munich, Germany.
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