Impaired visual processing of letter and digit strings in adult dyslexic readers

The slow word reading of developmental dyslexics may stem from a string processing impairment which in turn reflects visual attentional deficits. We indeed found substantially enhanced recognition time thresholds in the dyslexic adult readers. However, their position profiles were hard to reconcile...

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Bibliographic Details
Published in:Vision research (Oxford) 2006-03, Vol.46 (5), p.718-723
Main Authors: Hawelka, Stefan, Huber, Christine, Wimmer, Heinz
Format: Article
Language:English
Subjects:
Adolescent
Adult
Attention
Biological and medical sciences
Developmental dyslexia
Disorders of higher nervous function. Focal brain diseases. Central vestibular syndrome and deafness. Brain stem syndromes
Dyslexia - psychology
Female
Fundamental and applied biological sciences. Psychology
Humans
Male
Medical sciences
Nervous system (semeiology, syndromes)
Neurology
Neuropsychological Tests
Pattern Recognition, Visual
Perception
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Reading
Reading fluency
Recognition (Psychology)
Sensory Thresholds
Vision
Visual attention
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Description
Summary:The slow word reading of developmental dyslexics may stem from a string processing impairment which in turn reflects visual attentional deficits. We indeed found substantially enhanced recognition time thresholds in the dyslexic adult readers. However, their position profiles were hard to reconcile with any of the discussed visual attentional deficit hypotheses and with the prediction that dyslexic readers suffer from an absent string processing system as they exhibited similar M-shaped position profiles for digit and letter strings as the normal reading controls.
ISSN:0042-6989
1878-5646
DOI:10.1016/j.visres.2005.09.017