Can blindsight outperform sighted-sight?
” Perception 33 ECVP Abstract Supplement Can blindsight outperform ‘sighted-sight’? C T Trevethan, A Sahraie, L Weiskrantz DB, the first blindsight case to be tested extensively, is able to detect and discriminate visual stimuli in his perimetrically blind field that are considerably less detectable than the optimal stimulus parameters often required to elicit blindsight. We tested DB’s ability to carry out 3 psychophysical visual tasks in his visual field defect compared to his sighted field. Using a 2AFC paradigm we investigated DB’s ability to detect low-contrast Gabor patches and to discriminate between an outline square and a rectangle. Using a forced-response paradigm, DB made a same/different discrimination between the presentation of two rectangles compared to a square and a rectangle. In his field defect, DB detected the presence of an 8% contrast stimulus, compared to a sighted field threshold of 15%. DB also demonstrated significantly superior performance on both the square
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