Abstract
As spontaneous oto-acoustic emission (SOAE) was selectively suppressed by an external tone, isosuppression tuning curve of SOAE was measured in this study. This tuning curve demonstrated the similar characteristic frequency to the threshold tuning curve of primary auditory neurons, and the suppression effect of an external tone was most remarkable at the SOAE frequency.
In addition the tuning curve showed a second small dip in higher frequency than that of SOAE. We could not defermine the functional correlates with the threshold tuning curve. However, the selective suppression of SOAE could suggest a positive feedback gain control system in the cochlea.
