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

By L. Weiskrantz

Harm to the neocortex is usually understood to lead to blindness. reports of a few sufferers who've suffered from this type of blindness have, however, printed that they could discriminate particular types of visible occasions inside of their "blind" box. notwithstanding, sufferers accomplish that with no being conscious of this skill: they suspect they're basically "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 huge curiosity between neuroscientists, psychologists, and philosophers, who see attainable implications for theories of notion and for realization. This now vintage booklet, first released in 1986, provides an account of analysis over the variety of years right into a specific case blindsight, including a dialogue of the old and neurological heritage. A different situations said by way of different investigators and a couple of theoretical and sensible 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 resources for Blindsight: a case study and implications

Example text

Cross-Hemifield Interactions The seminal work of Torjussen (1976, 1978) demonstrating 'completion' of shapes shown to both the blind and intact hemifields simultaneously was reviewed in BLST. , and also by Perenin et al. (1985). (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.

In a related study, the manipulation of spatial as well as temporal transients also allowed a specification to be made of both the spatial and the temporal parameters required for good detection. Y. there is a narrowly tuned spatiotemporal visual 'channel' that is patent in the blind field, with a peak of about 1 cycle/degree and a cut-off ('acuity') of about 7 cycles/degree (Barbur et al. 1994a). Subsequently, this has been linked to the same, or at least a closely similar, channel in monkeys revealed by pupillometry (see below).

Has been the subject both of PET and functional MRI investigations. With PET (Barbur et al. 1993), the difference between moving and stationary bars was studied. The results focused on the activation found in area V5 in association with moving stimuli. Y. was well able to discriminate movement from non-movement with the parameters used in the PET study. 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.

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