The Japanese journal of neuropsychology

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ArticleTitle	The dichotic listening test for hemi-central hearing disorders -Examination with competing noise-
Language	J
AuthorList	Tsuneo Harashima¹⁾, Tomoyoshi Yoshino¹⁾, Akiyoshi Katada²⁾, Tadashi Ichikawa³⁾
Affiliation	1) Institute of Disability Sciences, University of Tsukuba 2) Kinjo University 3) Department of Neurology, Saitama General Rehabilitation Center
Publication	Japanese Journal of Neuropsychology: 16 (3), 208-218, 2000
Received	May 6, 1998
Accepted	Apr 17, 2000
Abstract	We studied four persons with hearing difficulty after hemi-cerebral lesions by the dichotic listening test. Three cases complained of hearing difficulty to the ear contralateral to the cerebral lesion after the cerebral apoplexy. The other one case who suffered from wernicke aphasia, complained of hearing difficulty for the language, after the cerebral apoplexy. The dichotic listening test consisted of five conditions of the presentations; 1) presenting a word to one side ear, 2) presenting a word to one side ear, and a white noise to the other side ear, 3) presenting a word to one side ear, and a multi-talker noise to the other side ear, 4) presenting two different words alternatively, one to each ear, 5) presenting two different words simultaneously, one to each ear. These results showed that the multi-talker noise to the ear to the cerebral lesioned side, suppressed the hearing of the ear contralateral to the cerebral lesion. We hypothesize that there may be the specific central processing for speech sound, and specific masking effect of the speech sound noise.
Keywords	dichotic listening, competing noise, ear extinction, central auditory dysfunction