Twenty-five CAT-scan-confirmed stroke patients and 25 matched controls were studied. All the stroke patients were stable 2-3 months after unilateral hemispheric stroke. Those with ear disease, other central neurological disorder, severe dysphasia and acute or chronic confusion were excluded. There were no significant differences between the groups for average pure tone hearing threshold (APTT) or ability to discriminate pre-recorded speech presented to one ear at 35 decibels (dB) above APTT. The stroke subjects had significantly impaired performance on dichotic competing sentence testing (DCST). Seventeen stroke patients but only one control subject failed DCST. Failure rate was similar for left and right stroke and for temporal and non-temporal lobe involvement. Two-thirds of patients failing DCST did so in the ear opposite the side of the cortical lesion. We conclude that (i) DCST is useful in detecting central auditory dysfunction in stroke patients; and (ii) stroke can affect central auditory perception in older patients.
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