Abstract
Clinical and audiological observations were made on 78 cases with recent history of head blow.
In addition to conventional pure tone audiometry, Békésy-type audiometry, distorted speech test using high or low pass filter for Japanese monosylabic words and binaural hearing test were employed for further evaluation of hearing acuity.
EEG and vestibular test were also performed in some cases.
An attempt was made to clarify hearing impairments following head injury as follows;
1) middle ear type
2) labyrinthine type
3) retro-cochlear type
4) middle ear & labyrinthine type
5) labyrinthine & retro-cochlear type
6) middle ear & retro-cochlear type
7) middle ear & labyrinthine & retrocochlear type
