Author: Galaburda, A.; Livingstone, M.
Description: Developmental dyslexia is the selective impairment of reading skills despite
normal intelligence, visual acuity, motivation, and instruction. Several lines of evidence suggest that dyslexic subjects process visual information more slowly than
normal subjects. The flicker fusion rate, which is the fastest rate at which a contrast reversal of a stimulus can be seen, is abnormally slow in dyslexic children at low spatial frequencies and low contrasts. Moreover, such visual abnormalities were reported to be found in over 75 percent of the reading-disabled children tested. When two visual stimuli are presented in rapid succession, the two images fuse and appear as a single presentation; the temporal separation necessary to distinguish two presentations measures visual persistence, and this is up to 100 ms longer for dyslexic than for normal children. In contrast, dyslexics perform normally on tests having prolonged stimulus presentations.
Subject Headings: Magnocellular defect; Dyslexia, Developmental
Subject headings:
Publication year: 1993
Journal or book title: Annals of the New York Academy of Sciences
Volume: 682
Issue: 1 Temporal Info
Pages: 70-82
Find the full text :Â https://nyaspubs.onlinelibrary.wiley.com/doi/abs/10.1111/j.1749-6632.1993.tb22960.x
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Type: Journal Article
Serial number: 2235