Temporal suppression of long-latency click-evoked otoacoustic emissions
Abstract
This paper investigates suppression of click-evoked otoacoustic emissions (CEOAEs) using the same paradigm as Hine and Thornton (2002) in which a suppressor-click was presented close in time to a test-click. The experiment was repeated and the analysis extended to long-latency CEOAEs (duration > 20 ms), whereas the previous study only focussed on the 'short-latency' CEOAE (duration < 20 ms). The hypothesis was that suppression would continue on the long-latency CEOAE since this region is probably dominated by spontaneous OAEs (SOAEs) synchronising with the click stimulus. The results for ve exemplary subjects showed that suppression remained on the long-latency CEOAE, indicating that both SOAEs and CEOAEs originate from the same cochlear nonlinearities, as suggested by Kemp and Chum (1980a). Further proof of suppression of long-latency SOAE components was sought in the spectral domain. A comparison of the magnitude of certain SOAE components in the suppressed and unsuppressed condition for a particular subject showed that suppression affected SOAE components in a similar way as the purely click-evoked OAE components.
References
Hine, J. E. and Thornton, A. R. D. (2002). “Temporal nonlinearity revealed by transient evoked otoacoustic emissions recorded to trains of multiple clicks,” Hear. Res. 165, 128-141.
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