Do stutterers have neurological abnormalities?

Brain scans of adult stutterers have found several neurological abnormalities: • During speech adult stutterers have more activity in their right hemispheres, which is associated with emotions, then in their left hemispheres, which is associated with speech. Non-stutterers have more left-hemisphere activity during speech. It is unknown whether this abnormal hemispheric dominance results from something wrong with stutterers' left-hemisphere speech areas, with right-hemisphere area unsuited for speech taking over speech tasks; or whether the unusual right-hemisphere activity is related to fears, anxieties, or other emotions stutterers associate with speech.

• During speech, adult stutterers have central auditory processing underactivity. What this means is unknown. One study suggested that stutterers may have an inability to integrate auditory and somatic processing, i.e.

, comparing how they hear their voices and how they feel their muscles moving. • A brain scan study examined the ... more.

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