Relationships between DPOAE and TEOAE amplitude and phase characteristics

Most published data comparing the amplitudes of transient evoked otoacoustic emissions (TEOAEs) and bi-tonally evoked otoacoustic emissions (DPOAEs) indicate a low level of correlation, raising the question to what extent do the two responses share the same relationship with hearing function. However, DPOAE intensities are sensitive to stimulus parameters and comparisons with TEOAE have mostly been made with the specific range of DPOAE parameters found to optimize DP output level. To determine if other DPOAE stimulus parameter domains give closer correspondence between TEOAE and DPOAE characteristics, 2 f1−f2 and 2 f2−f1 DPOAE intensity and phase measurements were made across a sample 1/2-octave frequency range centered on 2 kHz in nine normally hearing subjects using a wide range of stimulus parameter configurations. The DP fine structure was resolved by detailed measurements and the mean DP levels were compared to those in the corresponding frequency range from TEOAE measurements obtained with the same ...