In measuring stimulated otoacoustic emissions, other stimulus-dependent acoustic phenomena can be recorded between the stimulus tone and the emissions. The stimulus-dependent phenomena which responded to stimulus tone with 3 ms duration existed at 6 ms or thereabout after onset of stimulus. This stimulus-dependent responses revealed a linear input-output relationship. Similar stimulus-dependent responses were observed in guinea pigs. Anoxia induced a decrease of the response but applications of muscle relaxant did not. The stimulus-dependent response may be not related as the intracochlear micromechanics linked with active mechanical process.