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Why is blindsight blind?

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It is proposed that there are at least two categories of blindsight. One is present in visually guided behaviour in normals as well as in brain-damaged patients, while the other is present only following cortical lesions. It is also proposed that blindsight is blind because residual visual functions are banned from consciousness either when they are subserved by subcortical centres alone or when they are mediated by cortical areas that have never been exclusively associated with such functions before brain injury.

Keywords: Reaction time; blindsight; hemianopia; hemineglect; hemispherectomy; redundant target effect; unilateral extinction

Document Type: Research Article

Affiliations: Dipartimento di Scienze Neurologiche e della Visione, Universita di Verona, Strada Le Grazie 8, 37134 Verona, Italy.

Publication date: May 1, 1999


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