Tactile perception in developmental dyslexia: A psychophysical study using gratings

Arthur C. Grant, Andro Zangaladze, Mahesh C. Thiagarajah, Krishnankutty Sathian

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

Multiple sensory abnormalities have been reported in individuals with developmental dyslexia, especially in the visual and auditory systems. We used gratings of alternating ridges and grooves to investigate tactile perception in this disorder using two tasks: spatial acuity-dependent discrimination of grating orientation and discrimination of gratings varying in ridge width. Compared to age-matched normal subjects, dyslexics were significantly impaired on grating orientation discrimination, with mean thresholds that were nearly twice normal. Unlike normal subjects, their performance on this task was slightly but significantly worse on the dominant hand than on the non-dominant hand. Dyslexics also showed a substantial but non-significant trend for impairment on grating ridge width discrimination. A group of subjects with attention deficit disorder did not differ significantly from normal on any of these measures. These findings expand the range of perceptual deficits reported in developmental dyslexia. Possible explanations for the results, including difficulties with temporal processing, abnormal lateral masking or parietal lobe dysfunction are discussed. Copyright (C) 1999 Elsevier Science Ltd.

Original languageEnglish (US)
Pages (from-to)1201-1211
Number of pages11
JournalNeuropsychologia
Volume37
Issue number10
DOIs
StatePublished - Jan 1 1999

Fingerprint

Touch Perception
Dyslexia
Hand
Multiple Abnormalities
Parietal Lobe
Task Performance and Analysis
Attention Deficit Disorder with Hyperactivity
Discrimination (Psychology)

All Science Journal Classification (ASJC) codes

  • Experimental and Cognitive Psychology
  • Cognitive Neuroscience
  • Behavioral Neuroscience

Cite this

Grant, Arthur C. ; Zangaladze, Andro ; Thiagarajah, Mahesh C. ; Sathian, Krishnankutty. / Tactile perception in developmental dyslexia : A psychophysical study using gratings. In: Neuropsychologia. 1999 ; Vol. 37, No. 10. pp. 1201-1211.
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Tactile perception in developmental dyslexia : A psychophysical study using gratings. / Grant, Arthur C.; Zangaladze, Andro; Thiagarajah, Mahesh C.; Sathian, Krishnankutty.

In: Neuropsychologia, Vol. 37, No. 10, 01.01.1999, p. 1201-1211.

Research output: Contribution to journalArticle

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