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Diminished auditory mismatch fields in dyslexic adults
Author(s) -
Renvall Hanna,
Hari Riitta
Publication year - 2003
Publication title -
annals of neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.764
H-Index - 296
eISSN - 1531-8249
pISSN - 0364-5134
DOI - 10.1002/ana.10504
Subject(s) - audiology , dyslexia , binaural recording , psychology , auditory cortex , stimulus (psychology) , reading (process) , lateralization of brain function , laterality , scalp , medicine , cognitive psychology , anatomy , linguistics , philosophy
Electroencephalographic studies have demonstrated smaller auditory responses to infrequent deviances of speech and nonspeech sounds in dyslexic than normal‐reading subjects. We used a whole‐scalp neuromagnetometer to study selectively reactivity of the auditory cortices to sound deviances in 8 dyslexic and 11 normal‐reading adults. Within a monotonous sequence of 50‐millisecond 1,000Hz binaural tones, tones of 920 and 1,080Hz occurred with 7% probability each. Magnetic mismatch fields, elicited by the stimulus deviances, were diminished in the left hemisphere of the dyslexic subjects. The results indicate deficient change detection in the left auditory cortex of right‐handed dyslexic adults. Ann Neurol 2003