By Lawrence Weiskrantz
Harm to the neocortex is mostly understood to lead to blindness. reviews of a few sufferers who've suffered from this kind of blindness have, however, published that they could discriminate particular types of visible occasions inside their "blind" box. besides the fact that, sufferers accomplish that with no being conscious of this skill: they believe 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 belief and for awareness.
This now vintage ebook, first released in 1986, provides an account of study over the variety of years right into a specific case blindsight, including a dialogue of the historic and neurological history. A different instances suggested via 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
Visual detection in monkeys with blindsight. Neuropsychologia 35, 929-1997. , and Perry, V. H. (1989). Transneuronal retrograde degeneration of retinal ganglion cells after damage to striate cortex in macaque monkeys: Selective loss of P-beta cells. Neuroscience 29, 65-80. Dennett, D. C. (1991). Consciousness explained. Penguin Press, London. , and Øhman, A. (1994). Nonconscious associative learning: Pavlovian conditioning of skin conductance responses to masked fear-relevant facial stimuli. Psychophysiology 31, 375-385.
NeuroReport 7, 793-797. , and Hécaen, H. (1980). Residual visual capacities in a case of cortical blindness. Cortex 16, 605-612. , and Jeannerod, M. (1985). From completion to residual vision in hemianopic patients. Paper delivered at meeting of European Brain and Behaviour Society, Oxford. , and Ptito, M. (1987). Visual discrimination in hemispherectomized patients. Neuropsychologia 25, 869-879. , and Lassonde, M. (1991). Target detection and movement discrimination in the blind field of hemispherectomized patients.
Y. (and other subjects) using particular fixed temporal and spatial Gaussian envelopes of homogeneous stimuli. This was confirmed (Weiskrantz et al. Y. in his blind hemifield. This, and another example of an apparently unfortunate choice of parameters is discussed in CL&F, p. 154-5, 247-8. Finally, another possible reason for variable incidence is the strangeness of the question that the researcher is bound to ask when testing Blindsight Type 1. Some subjects find it awkward or tiresome to be asked to guess about stimuli of which they have no awareness, and some refuse to do so.