Wide and Diffuse Perceptual Modes Characterize Dyslexics in Vision and Audition

Author:

Geiger Gadi,Cattaneo Carmen1,Galli Raffaella1,Pozzoli Uberto1,Lorusso Maria Luisa1,Facoetti Andrea12,Molteni Massimo1

Affiliation:

1. Scientific Institute ‘Eugenio Medea’, I 23842 Bosisio Parini (Lecco), Italy

2. Department of General Psychology, University of Padua, via Venezia 8, I 35131 Padua, Italy

Abstract

We examined the performance of dyslexic and typically reading children on two analogous recognition tasks: one visual and the other auditory. Both tasks required recognition of centrally and peripherally presented stimuli. Dyslexics recognized letters visually farther in the periphery and more diffuse near the center than typical readers did. Both groups performed comparably in recognizing centrally spoken stimuli presented without peripheral interference, but in the presence of a surrounding speech mask (the ‘cocktail-party effect’) dyslexics recognized the central stimuli significantly less well than typical readers. However, dyslexics had a higher ratio of the number of words recognized from the surrounding speech mask, relative to the ones from the center, than typical readers did. We suggest that the evidence of wide visual and auditory perceptual modes in dyslexics indicates wider multi-dimensional neural tuning of sensory processing interacting with wider spatial attention.

Publisher

SAGE Publications

Subject

Artificial Intelligence,Sensory Systems,Experimental and Cognitive Psychology,Ophthalmology

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