Contribution of auditory tasks to dyslexia screening.

Dyslexia is a specific disorder of language. Research on the origin of dyslexia has led to multiple hypotheses and various rehabilita- tion treatments. This paper evaluates the ability of different audi- tory tasks to screen dyslexia. Three tasks are tested: a temporal modulation transfer function task where the detection thresholds of sinusoidal amplitude modulation applied to a noise carrier are measured and identification and discrimination tasks of two natu- ral syllables /ba/-/pa/ to evaluate the categorical perception skills in children with developmental dyslexia. The results obtained in dyslexics and normal readers are compared. Statistical analyses (Mann-Whitney test and logistic regression model) are performed in order to evaluate the contribution of these tasks to dyslexia de- tection. This study includes 35 dyslexic children and 78 normal readers.