Abstract
The click-evoked otoacoustic emission (CEOAE) level-curve grows linearly for clicks below 40–60
dB and saturates for higher inputs. This study investigates dynamic (i.e., time-dependent) features of
the CEOAE level-curve by presenting a suppressor-click less than 8 ms before the test-click. An
alteration of the CEOAE level-curve, designated here as temporal suppression, was observed within
this time period, and was shown to depend on the levels and the temporal separation of the two
clicks. Temporal suppression occurred for all four subjects tested, and resulted in a vertical
offset from the unsuppressed level-curve for test-click levels greater than 50 dB peak-equivalent
level (peSPL). Temporal suppression was greatest for suppressors presented 1–4 ms before the test
click, and the magnitude and time scale of the effect were subject dependent. Temporal suppression
was furthermore observed for the short- (i.e., 6–18 ms) and long-latency (i.e., 24–36 ms) regions of
the CEOAE, indicating that temporal suppression similarly affects synchronized spontaneous otoacoustic
emissions (SSOAEs) and purely evoked CEOAE components. Overall, this study demonstrates
that temporal suppression of the CEOAE level-curve reflects a dynamic process in human
cochlear processing that works on a time scale of 0–10 ms.
Original language | English |
---|---|
Journal | Acoustical Society of America. Journal |
Volume | 129 |
Issue number | 3 |
Pages (from-to) | 1452-1463 |
ISSN | 0001-4966 |
DOIs | |
Publication status | Published - 2011 |