The result of observation of the effect of sound load on extrinsic tinnitus of 1, 354 cases was as follows:
1) The response was higher on the side where sound load was laid than on the other. The subjects were classified into the young group, the middle-age group, and the old group, and the response to sound load seemed to be the highest in the middle-age group.
2) When the subjects were classified into groups according to the causes of tinnitus (such as head trauma, noise trauma, miscellaneous cases), then according to qualities of tinnitus (such as continuous, intermittent, non-tinnitus), it was found that greater differences in response to sound load were significantly observed among the latter groups than among the former.
3) Among the patients in the groups classified according to their qualities of tinnitus, those who showed changes in qualities of their tinnitus were larger in number in younger patients than in older ones, but those who showed a rise or occurrence of tinnitus were larger in number in older patients than in younger ones.
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