Fig 1.
Histogram of SSOAEs frequencies.
Fig 2.
Example of the latency determination procedure.
Envelopes of a 1 kHz TBOAE from a single subject are shown on a linear scale for stimulus levels from 40 to 80 dB. The white circles connected with solid lines mark the same maxima across different stimulus levels. Black circles (slightly offset for clearer presentation) connected with a dashed line mark the highest response for each stimulus level (the WS latency).
Fig 3.
Mean input/output (I/O) functions measured as global response levels of TBOAEs for 4 different stimulus frequencies (center frequency given above each plot).
Results are shown for ears with SSOAEs (solid line) and ears without SSOAEs (dashed line). Error bars indicate standard errors; asterisks at top of each panel indicate statistically significant differences (*–p<0.05; **–p<0.01).
Fig 4.
Mean I/O functions of TBOAEs measured in 4 half-octave bands (centre frequencies at top).
Other details as in Fig 3.
Fig 5.
Mean I/O functions for CEOAEs measured globally (top plot) and in half-octave bands (four bottom plots).
Asterisks at top of each panel indicate statistically significant differences (*–p<0.05; **–p<0.01; ***–p<0.001). Other details as in Fig 3.
Fig 6.
TBOAE level plotted against CEOAE level, both measured in half-octave bands, for 60, 70, and 80 dB stimuli.
The data are plotted for ears with SSOAEs (dots) and without SSOAEs (circles). Linear fits for each group are also shown (solid: with SSOAEs; dashed: without SSOAE). Dotted line shows y = x line as reference. Percent correlations and R2 values for fits shown (‘+’, with SSOAEs; ‘–′, without SSOAEs).
Fig 7.
Comparison of mean TBOAE thresholds (left) and CEOAE thresholds (right) for cases with SSOAEs (solid line) and without SSOAEs (dashed line).
Measurements were made in half-octave bands for both, and for TBOAEs the stimulus frequency matched the centre frequency of the analysis band. Error bars indicate standard errors; asterisks mark statistically significant differences (*–p<0.05).
Fig 8.
Mean latencies of TBOAEs measured in half-octave bands as a function of stimulus level.
The latencies were taken to be the location of the maximum of the whole signal (WS, see Fig 2). Results for 4 different stimulus frequencies are plotted for ears with SSOAEs (solid lines) and without SSOAEs (dashed lines). Error bars indicate standard errors. There were no statistically significant differences between ears with SSOAEs and without SSOAEs for any frequency and stimulus level.
Fig 9.
Mean latencies of SL and LL components of TBOAEs (left) and corresponding I/O functions (right).
Each row corresponds to a different TBOAE frequency.