Abstract
This chapter reviews the disorders of perpetual awareness. Perceptual awareness relates to the axiom that all of what one attends to, and only what one attends to, is present in the consciousness. In patients with perceptual awareness disorders, two cases can be visible: (1) where they apparently see more stimuli under one response condition than under the other and (2) where a cortically blind patient may do less well in a detection task when responding verbally than manually. In some commissurotomy experiments, motor responses are able to convey far more than just the binary information in a single keypress, and they may provide evidence of functioning that is similar in character to that evident in the verbal left hemisphere. The attribution of consciousness must remain a conjecture in all cases where the verbal commentary is not available. A second-order account may offer a ready understanding of covert visual capacities in blindsight and form agnosia and of dissociation phenomena in neglect.
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