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BlindsightA Case Study and Implications$
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L. Weiskrantz

Print publication date: 1990

Print ISBN-13: 9780198521921

Published to Oxford Scholarship Online: January 2008

DOI: 10.1093/acprof:oso/9780198521921.001.0001

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Detection of direction of contrast

Detection of direction of contrast

(p.94) 12 Detection of direction of contrast

L. Weiskrantz

Oxford University Press

D. B. acknowledged having some sort of impression or feeling when a stimulus was abruptly presented, but failed to ascribe any sense of ‘brightness’ to the experience. This led to the question of whether he could respond differentially to the direction of contrast of a stimulus. He was instructed to guess whether a stimulus (a small black or white square on a gray ground) was black or white, and had no difficulty in doing so. He did not describe them as being bright or dark, but said one of them (the white one) seemed ‘closer’ to him while the other seemed ‘farther away’. This type of comment was consistent with his reports in presence/absence judgments, in which he also made reports of the relative ‘closeness’ of the event.

Keywords:   contrast, black, white, gray ground, brightness, closeness

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