Neurological and neuropsychological deficiencies in a group of older adolescents with dyslexia.

A group of 34 male adolescents with poor results on a spelling test and 34 controls were examined neurologically and neuropsychologically. The index group was inferior to the controls mainly in tasks involving fine motor control of the left hand, but also in auditory non-verbal sequential information processing and phoneme manipulation tasks. The manual sequencing disorder and the verbal and non-verbal auditory problems could be interpreted in terms of deficient information-processing in the left hemisphere, but the reason for the psychomotor disorder of co-ordination, mainly in the left hand, remains unclear.