The investigation was carried out for the purpose of clarifying the deviation of the angular localization by using various types of hearing aids, and the relation between the microphone's position of a binaural hearing aid and its directional hearing.
The procedure was performed at 9 locations on a half circle in front of the subject by means of pointing out the sound source. The subjects were normal hearing adults and various types of hearingimpaired.
The results were as follows :
i) The error of angular localization at each test location was shown on the deviation curves in 7 types, and the results were checked for its mechanism.
ii) In cases of using the monaural hearing aid, the deviation of angular localization increased at the contralateral side of the hearing aid. In cases of the binaural hearing aid, it increased at bolh lateral sides
iii) The acuity of directional hearing by using the binaural hearing aid is maintained much better than that of the monaur al aid. In cases of binaural hearing aids, it is advisable for the microphones to be worn on the bilateral temporal parts of the head, because of the important role of the shadow effect of the head for directional hearing by using the hearing aid.
iv) In cases of the Y-cord type hearing aid, the directional hearing acuity was completely disturbed.
v) The efficiency of the hearing aid for the directional hearing is similar to that for the binaural listening.
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