Otoacoustic emissions provide a non- invasive window into cochlear function, being presumably a by-product of the action of the cochlear amplifier. This study aims to use otoacoustic emissions to examine the question of propagation time along the cochlear partition; i.e., does the delay of the emission essentially reflect the delay associated with the action of the cochlear mechanical amplifier? The group delay of amplitude- modulated tone-burst evoked otoacoustic emissions will be measured in guinea pigs and humans, the guinea pig data compared with basilar membrane data in an attempt to delineate a """"""""propagation component"""""""", if it exists. This study will also compare measured group delay values with phase-gradient estimate of delays obtained using distortion product otoacoustic emission sweep-frequency paradigms, the thesis being that such paradigms do not provide for travel times within the cochlea.
| Withnell, Robert H; McKinley, Sarah (2005) Delay dependence for the origin of the nonlinear derived transient evoked otoacoustic emission. J Acoust Soc Am 117:281-91 |
| Goodman, Shawn S; Withnell, Robert H; De Boer, Egbert et al. (2004) Cochlear delays measured with amplitude-modulated tone-burst-evoked OAEs. Hear Res 188:57-69 |
| Withnell, Robert H; Shaffer, Lauren A; Talmadge, Carrick L (2003) Generation of DPOAEs in the guinea pig. Hear Res 178:106-17 |
| Goodman, Shawn S; Withnell, Robert H; Shera, Christopher A (2003) The origin of SFOAE microstructure in the guinea pig. Hear Res 183:7-17 |
| Shaffer, Lauren A; Withnell, Robert H; Dhar, Sumit et al. (2003) Sources and mechanisms of DPOAE generation: implications for the prediction of auditory sensitivity. Ear Hear 24:367-79 |
