Download Blindsight: a case study and implications by L. Weiskrantz PDF

By L. Weiskrantz

ISBN-10: 0198521928

ISBN-13: 9780198521921

Harm to the neocortex is usually understood to lead to blindness. experiences of a few sufferers who've suffered from this kind of blindness have, however, printed that they could discriminate particular types of visible occasions inside of their "blind" box. besides the fact that, sufferers accomplish that with no being conscious of this skill: they believe they're merely "guessing". This phenomenon has been termed "blindsight" by way of Professor Weiskrantz and his collaborators, who have been one of the first to explain it. It has attracted massive curiosity between neuroscientists, psychologists, and philosophers, who see attainable implications for theories of notion and for awareness. This now vintage ebook, first released in 1986, offers an account of analysis over the variety of years right into a specific case blindsight, including a dialogue of the historic and neurological historical past. A different instances mentioned via different investigators and a couple of theoretical and functional concerns and implications are reviewed. All neuroscientists and psychologists with an curiosity within the phenomena will welcome this reissued model.

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Extra info for Blindsight: a case study and implications

Example text

Took pains to be well clear of any such expanded vertical strip of recovered vision in the positioning of the stimulus in the blind hemifield. Thus, visual processing can take place in the absence of V1 and remaining cortex in at least some hemispherectomized patients. Just prior to finishing this Introduction, Sahraie, Varga-Khadem and I had been investigating more complex cross-field interactions in hemispherectomized patients in still unpublished work. We have found a clear Page xxvii completion effect for form as first demonstrated by Torjussen (1976, 1978) and later by Marcel and by Perenin et al.

Some further experimental extensions of this paradigm are discussed by Cowey and Stoerig in 1997 which is also an excellent review of comparative blindsight research on humans and Page xvii monkeys. At a more general level, the matter is also discussed in CL&F, (Chapter 4). Two important recent experiments by Charles Gross and his colleagues are also relevant to the animal-human parallel. They trained monkeys to make a rapid ('saccadic') eye movement from the point of fixation to a visual target in their blind hemifields (Moore et al.

In the 'unaware' mode associated with good discrimination by 'guessing', and found only in this mode, there was activation in the superior colliculus. While activation of particular structures were found that were uniquely associated with 'awareness' and 'unawareness' modes respectively, the conclusion of the paper stressed the general change in pattern between the two modesfrom dorsolateral structures in the former, to medial and subcortical structures in the latter. The results are provocative, but must be considered provisional given the limited number of observations possible in this single subject.

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