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Temporal Processing in Dyslexia

Kimron L. Shapiro is an associate professor of cognitive psychology at the University of Calgary. His research interests lie in various aspects of cognition, both basic and applied.

Nancy Ogden, MSc

Nancy Ogden recently obtained her MSc at the University of Calgary and is currently pursuing a PhD. Her major interests lie in the area of applied visual perception.

Faine Lind-Blad, BA

Faine Lind-Blad received her BA with first-class honors in psychology from the University of Calgary in 1986. She is currently preparing to attend medical school at the same university. Address: Kimron L. Shapiro, Department of Psychology, University of Calgary, 2500 University Dr. NW, Calgary, Alberta, Canada T2N 1N4.

The temporal processing capabilities of 15 children with dyslexia versus 15 age-matched and 15 reading-matched controls in a word identification task were examined. The hypothesis underlying the present experiment was that word recognition would be inferior in children with dyslexia, relative to controls, when the task demanded the temporal integration (sequencing) of two-syllable words. Such a hypothesis must predict that one-syllable word recognition does not distinguish between these two populations and that these effects cannot be accounted for in terms of eye movement differences. To test this hypothesis, one- and two-syllable words displayed for 100, 300, and 3,000 msec were required to be identified. The results yielded evidence of decreased accuracy of word identification by the children with dyslexia in the two-syllable, 300-msec condition, as predicted. A second experiment was unable to uncover any differences in eye movement behaviors that could account for the effects observed in the first experiment. The results are discussed in terms of potential sequential processing deficits in individuals with dyslexia.

Journal of Learning Disabilities, Vol. 23, No. 2, 99-107 (1990)
DOI: 10.1177/002221949002300205


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