大脳半球損傷患者の語音認知障害の分析
—失語症患者を中心に—

抄録

    We developed a new method of cortical audiometry using non-filtered Japanese CV monosyllables selected from a phonological standpoint. The test materials were recorded on magnetic tape and presented to the ear through a receiver at 50 dB above the patient's subjective threshoh at 1000 Hz.
    Fourty subjects including six with motor aphasia, nine with sensory aphasia, six with lesions of the right temporal lobe, nine with moderate sensorineural hearing loss and ten normal adults were tested by our method.
    The results obtained were as follows:
    1) The discrimination of the monosyllables was poorer in the ear contralateral to the lesion of the temporal lobe.
    2) Discrimination errors appeared primarily in consonants, and discrimination errors of the vowels were limitted to the patients with sensory aphasia in whom discrimination of the monosyllables was severely impaired.
    3) The most prominent discrimination errors of the consonant observed in every case was confusion to/r/.
    4) The syndrome of sensory aphasia was classified into two groups by qualitatively different responses obtained on our test. Specifically for one group, discrimination errors occurred primarily on the phonetic or auditory level, while for the second group discrimination errors occurred on the phonological level.