Interrelationships between spontaneous and low-level stimulus-frequency otoacoustic emissions in humans

► Interrelationships between SOAEs and SFOAE investigated in individual ears. ► SOAE peaks correspond to regions of strong SFOAE activity; converse not necessarily true. ► SFOAE phase-gradient delays significantly longer for a stimulus level of 20 dB SPL (compared to 40 dB SPL). ► Phase-gradient delays are similar between subjects with and without strong SOAE activity. ► Data support predictions from the coherent reflection and global standing wave models.