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We tested the hypothesis that the differences in performance between developmental dyslexics and controls on visual tasks are specific for the detection of dynamic stimuli. We found that dyslexics were less sensitive than controls to coherent motion in dynamic random dot displays. However, their sensitivity to control measures of static visual form coherence was not significantly different from that of controls. This dissociation of dyslexics' performance on measures that are suggested to tap the sensitivity of different extrastriate visual areas provides evidence for an impairment specific to the detection of dynamic properties of global stimuli, perhaps resulting from selective deficits in dorsal stream functions.

Type

Journal article

Journal

Neuroreport

Publication Date

25/05/2001

Volume

12

Pages

1527 - 1530

Keywords

Adult, Dyslexia, Humans, Motion Perception, Neuropsychological Tests, Parietal Lobe, Pattern Recognition, Visual, Psychomotor Performance, Vision Disorders, Visual Cortex, Visual Pathways