Interrelation of different oto-acoustic emissions.

Amplitude and phase of the sound pressure measured in the closed ear canal during stimulation with pure tones have been monitored as a function of frequency for subjects with and without measurable spontaneous emissions. The frequency spacing between neighboring maxima of the evoked emissions is closely related to that found between neighboring spontaneous emissions. Similar data are found with delayed evoked emissions. All three catagories , spontaneous, delayed, and synchronous evoked emissions are closely related to each other and to the fine structure of threshold in quiet.