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Predictive Value of the Auditory and Visual Evoked Potentials Using the Wavelet Method and Visual n400 in Subjects Affected by Dyslexia and in Normal Subjects

Aiello G, Merati S, Toti MP, Aiello I

Purpose: The aim of this study is to verify that the neurobiological process of dyslexia is secondary to a perceptual deficit or to an abnormality of the processes related to semantic memory. Dyslexia represents a very important function in one’s individual cognitive development and being able to identify the etiology could offer the possibility to start a multidisciplinary treatment aimed at regaining the function. Methods: 13 subjects with dyslexia and 13 controls have been selected, all of whom underwent a neuropsychological evaluation which highlighted the presence of dyslexia. We then performed: EEG with frequency mapping, visual and auditory evoked potentials, both with further wavelet analysis, and visual N400. Results: Starting from these preliminary data, it has been shown that subjects with dyslexia present abnormalities in frequency composition of both visual and auditory evoked potentials, and that the N400 shows reduced amplitude. This is in accordance with a deficit which has a central origin.