Imaging studies yield a potential core marker for reading problems, underscore neurological basis of difficulties
Researchers have additional evidence that reading problems are linked to abnormal sound processing, thanks to high-precision pictures of the brain at work. In a recent study, when children without reading problems tried to distinguish between similar spoken syllables, speech areas in the left brain worked much harder than corresponding areas in the right brain, whose function is still unknown. But when children with dyslexia made the same attempt, those right-brain areas actually worked harder, going into overdrive after a brief delay. These findings appear in the October issue of Neuropsychology, which is published by the American Psychological Association (APA).
Psychologists at The University of Texas Health Science Center at Houston targeted the suspect brain areas by isolating speech-processing sites from sites involved with other aspects of language, such as memory and meaning. As a result, they believe their research contributes to the identification of a central marker of the deficit that makes it hard for people with dyslexia to process similar but different sounds –- in both spoken and written form. The results parallel prior evidence gathered by the Houston team that brains of children with dyslexia also respond abnormally during reading.
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