By L. Weiskrantz
Harm to the neocortex is mostly understood to bring about blindness. reviews of a few sufferers who've suffered from this manner of blindness have, however, published that they could discriminate particular types of visible occasions inside of their "blind" box. although, sufferers achieve this with out being conscious of this skill: they suspect they're purely "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 substantial curiosity between neuroscientists, psychologists, and philosophers, who see attainable implications for theories of conception and for cognizance. This now vintage ebook, first released in 1986, offers an account of study over the variety of years right into a specific case blindsight, including a dialogue of the historic and neurological historical past. A different circumstances mentioned by way of different investigators and a few theoretical and sensible 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 resources for Blindsight: a case study and implications
Page xxiii Some Continuing Issues Incidence Across a random sample of patients with hemianopias resulting from cortical damage, it would seem that blindsight is found only in a minority. Thus, as reviewed in BLST, Blythe et al. ) with evidence of residual function (responses to movement, and localization by reaching or eye movements) out of a studied population of 25. Similarly, I found in a study of acute hospital cases that 14 hemianopic patients out of 69 showed some evidence of residual function.
1985), who suggested that shrinkage of the field defect with practice was only found when it was measured in a dynamic perimeter, in which moving stimuli are used to plot the field defect, but not with a perimeter using static stimuli. Kasten and Sabel (1995), however, used both types of perimeters, dynamic and static, and have reported positive findings with each. 's sensitivity, especially for movement, has increased recently. If so, it is not surprising, given that his blind hemifield has been tested repeatedly and intensively within the past few years by 8 groups in Britain, as well as other groups in America, Holland, Germany, and Slovakia.
Both sets of results are displayed in Weiskrantz, 1990). A promising method was published by Rafal et al. (1990) in which it was found that the latency of a saccade to a stimulus in the intact hemifield was increased if an 'unseen' stimulus was presented just earlier to the blind hemifield of hemianopes. Thus, the subject only responds directly to 'seen' stimuli, but an inference can clearly be drawn about the processing of events in the impaired hemifield because of the modulation of the response to the events in the intact field.