One last line of evidence for unconscious processes comes from patients who have suffered brain damage. Patients suffering from Korsakoff's syndrome often have no conscious awareness of events they have witnessed or things they have done. Of asked directly about these events, the patients will insist that they have no recollection. Yet the patients do remember these events in some sense: on test of implicit memory, the amnestic patients seem quite normal, making it clear that they are influenced in their present and behaviors by the specific content of the prior episodes.
A similar pattern is evident in the phenomenon of blind sight. This is a pattern observed in patients who have experienced damage to the striate cortex. As a result of this brain damage, these patients are, for all practical purposes, blind: if asked to move around a room, they will bump into objects, they do not react to flashes of bright light. In one experiment, visual stimuli were presented to these patients, and they were forced to guess what the stimuli were. Quite reliably, these patients "guessed" correctly. If the patients were forced to guess where various objects were placed and to reach toward those objects, they tended to reach in the right direction with the appropriate hadn position. it seems that these patiens, in a sense, "see", but they are not aware of seeing.

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