Consciousness and Commentaries

There are several neuropsychological syndromes in which good residual function is retained in the absence of acknowledged awareness, among them blindsight, amnesia, and unilateral neglect. All of them point to the need in studying conscious awareness not only for an “on-line” demonstration of the relevant capacity, but for an independent commentary or classificatory response by the subject, whether human or animal. The parametric limits of blindsight (visual discrimination without awareness) can be measured using a “commentary key” psychophysical paradigm, and the results may possibly allow an approach to identifying neural structures involved in visual awareness.