Blindsight: a case study and implications by L. Weiskrantz

By L. Weiskrantz

Harm to the neocortex is usually understood to bring about blindness. stories 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 suspect they're simply "guessing". This phenomenon has been termed "blindsight" through Professor Weiskrantz and his collaborators, who have been one of the first to explain it. It has attracted significant curiosity between neuroscientists, psychologists, and philosophers, who see attainable implications for theories of notion and for realization. This now vintage e-book, first released in 1986, supplies an account of analysis over the variety of years right into a specific case blindsight, including a dialogue of the old and neurological history. A different instances mentioned through different investigators and a few theoretical and useful matters and implications are reviewed. All neuroscientists and psychologists with an curiosity within the phenomena will welcome this reissued model.

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Probably the most important is the variable extent of the occipital lesions in human subjects and the unlikelihood of any such lesion being restricted in V1, which itself is buried deep in the medial aspect of the brain. Animal work (cf. review in BLST) has demonstrated that extensions of lesions beyond V1 degrades the degree of residual function and many lesions seen clinically probably lead to the same diminution, especially as the visual association areas are tightly compressed in the proximity of V1.

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. Y. using the same 'aware' and 'unaware' parameters employed in the Weiskrantz et al.

1997, in our FMRI study). The SPECT analysis permitted only a single subtraction but it is reassuring to find some measure of overlap with FMRI. Another FMRI study explored the difference between red and green stimuli in the blind hemifield. Y. to red but not to green, using variable background luminance as a control, demonstrating that the response to red was genuinely chromatic. Here, too, an activation of the superior colliculus to the red but not to the green stimulus was found in the blind hemifield.

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