Stimulated acoustic emissions from the human ear

The influence of stimulus frequency upon the magnitude of stimulated acoustic emissions from within the human ear was studied. Stimuli of higher frequency generate much smaller emissions (responses) than stimuli of lower frequency at the same stimulus level. For low response levels the relation between stimulus level and response level is approximately linear. High response levels rise approximately as the cube root of stimulus level. A tuning curve could be derived by suppressing emissions with a second steady tone.