Blind vision : the neuroscience of visual impairment by Zaira Cattaneo PDF

By Zaira Cattaneo

ISBN-10: 0262295814

ISBN-13: 9780262295819

Can a blind individual see? The very thought turns out paradoxical. the following the authors learn the consequences of blindness and different varieties of visible deficit at the improvement and functioning of the human cognitive system.

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Extra info for Blind vision : the neuroscience of visual impairment

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These findings suggest that blind individuals may have a superior capacity for decoding the spatial structure of the activated SA-I afferent array through central processing mechanisms (Goldreich and Kanics 2003). In a following study, Goldreich and Kanics (2006) found that (early and late) blind outperformed sighted subjects in a grating-detection task requiring that they distinguish a thinly grooved surface from a smooth one. Since SA-I receptors respond well to edges, grooved surfaces elicit overall a greater SA-I population response-magnitude than do smooth surfaces (and hence, unlike a grating-orientation task, successful grating detection does not rely on the activated SA-I spatial structure cue) (see Johnson and Phillips 1981).

Brisben, Hsiao, and Johnson 1999). , edge contours, Braille reading marks), being selectively sensitive to points, edges and curvatures. Ruffini corpuscles have a smaller spatial resolution due to their large and less localized receptive fields. Ruffini afferents are critical in providing the brain with motion signals from the whole hand: in fact, they signal skin-stretch accurately, and are thus important (together with proprioception receptors) in the perception of hand shape and finger position, both of which are critical for grip control.

S1 and S2 (solid speakers) were the two stationary loudspeakers, which were located at 30 degrees to the right and to the left of the median plane of the subject’s head in a circular arc with a 90 centimeter radius centered on the midpoint of the interocular axis, and used as the standard stimuli. C’s (blank speakers) indicate the locations of the movable speakers, and where the comparison sound was presented. The observer judged whether the apparent direction of the sound from one of C1, C3 and C5 (C2, C4 and C6) was right or left of that from S1 (S2).

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Blind vision : the neuroscience of visual impairment by Zaira Cattaneo

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