Central and peripheral letter recognition in specific reading disability

TL;DRAbstract

In 1987, Geiger and Lettvin tested letter recognition in the right visual field and found that in late adolescents and adulthood SRDs had a letter recognition advantage in peripheral visual areas compared to normal readers at 7.5°, 10° and 12.5° of visual angle from fixation. They concluded that whereas normal readers attended to stimuli within a narrow range surrounding their point of fixation, so that information in the periphery was lost, dyslexics could identify letters in the periphery better than normal readers. The results also suggest that differences in low level visual processing which has been shown to be deficient in younger SRDs may persist into adulthood. The results may also be taken as further evidence for a visual difference between SRDs and normals for which there is increasing evidence. Specifically, Geiger and Lettvin's results may have some bearing upon Sustained/Transient functioning, hypothesized to be different in young SRDs from normal readers. Howe

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