Simultaneous recordings of binaural spontaneous otoacoustic emissions
(SOAEs) were made for 2 female subjects. For SOAEs below about 3.6 kHz
measured within a testing session, the frequencies of nearby monaural
and binaural SOAEs tended to move in tandem, whereas widely separated
SOAEs did not. Across many testing sessions spanning a menstrual cycl
e, all monaural and binaural SOAE frequencies shifted in tandem. Possi
ble mechanisms consistent with these results are discussed.