Title: Letter Identification and Lateral Masking in Dyslexics and Normal Readers
Abstract: Abstract Although dyslexia primarily seems to be a phonologically‐based disturbance, some recent evidence of visual‐perceptual factors being involved has been accumulated. In one frequently cited study (Geiger & Lettvin, 1987) dyslexics were reported to identify single or masked letters in the parafoveal area of vision with higher accuracy than normal readers. In the present investigation, accuracy and latency as a function of retinal position were studied in dyslexics and normal subjects. Target letters were exposed to the right or to the left of a fixation point at various levels of eccentricity. In contrast to the Geiger‐Lettvin findings, the dyslexics did not show any higher performance score in the peripheral visual fields. However, the dyslexic subjects had longer reaction times in all experimental conditions (single and embedded targets and all 10 spatial positions). For both groups, a right‐hemifield effect for the position closest to the fovea was found, which was interpreted in terms of lateral masking and attentional scanning.
Publication Year: 1993
Publication Date: 1993-01-01
Language: en
Type: article
Indexed In: ['crossref']
Access and Citation
Cited By Count: 8
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