By L. Weiskrantz
Harm to the neocortex is usually understood to lead to blindness. reviews of a few sufferers who've suffered from this manner of blindness have, however, published that they could discriminate specific sorts of visible occasions inside their "blind" box. although, sufferers accomplish that with out being conscious of this skill: they believe they're basically "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 substantial curiosity between neuroscientists, psychologists, and philosophers, who see attainable implications for theories of belief and for recognition. 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 old and neurological historical past. A different instances pronounced by way of different investigators and a couple of 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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Additional info for Blindsight: a case study and implications
1990), in which the reaction time of a key-press response to a light in the intact field could be lengthened by a light presented just earlier in the impaired field of human subjects. A similar finding has been reported for the monkeyan unseen target slows the reaction time to the seen target, especially at delays of the order of 400-500 msec (Stoerig and Cowey 1997). A related approach by Marzi et al. (1986) exploited the fact that the reaction time to two flashes presented simultaneously is consistently faster than the reaction time to a single flash, whether or not the two flashes appear in the same hemifield or whether they appear in opposite fields.
Y. , it was Blindsight Type 2; indeed, the authors drew the conclusion that there can be conscious awareness of movement in the absence of V1. Blindsight Type 1 was not investigated. The distinction between directional movement discrimination with and without awareness was the explicit focus of a subsequent FMRI study (Sahraie et al. 1997). The parameters that had previously been used to establish this difference psychophysically (Weiskrantz et al. 1995, see above) served as the basis of the stimuli in the imaging study using stimulus contrast and velocity as the variables.
To suggest to a subject that there is some special scientific value in being cajoled into making repeated guesses about unseen stimuli requires some suspension of credibility. In other areas of cognitive neuropsychology, residual function can be tested quite readily by methods that do not direct assault credibility (cf. survey in CL&F). For example, the amnesic patient can be asked to try to identify a word when presented with its first three letters to enable the experimenter to infer whether an earlier 'prime' by the word facilitates the identificationas it does.