Mean behavioral threshold (dB SPL) as a function of f 2 frequency (kHz). Error bars represent ±1 SD. Data from 19 to 20 normal-hearing subjects were used to derive these values, although the same subjects are not represented at each frequency.
Mean level (dB SPL) ±1 SD as a function of L 2 (dB SL). Open circles represent mean DPOAE level (L d ), while filled triangles represent mean noise levels. These data represent the mean levels measured during control conditions when no suppressor was present.
Left column: Mean L d (squares) and noise levels (triangles) as a function of L 3 (dB SPL). Error bars represent ±1 SD. Data for a different f 2 are shown in each row. In all four rows, L 2 = 40 dB SL (relative to each subject’s behavioral threshold at f 2). Right column: Decrement in dB (open circles) obtained by subtracting the L d in the presence of a suppressor from the average of two control conditions, in which no suppressor was present (see text for additional details). Only those points that showed at least 1 dB decrements and SNR ≥3 dB were included in a transformation (see text) and were subsequently fit with a straight line. The transformed data points are shown as filled circles. The fits to the transformed data provided the estimate of slope and were solved for the L 3 resulting in 3 dB of suppression, which was then used to construct the STCs in a companion paper (Gorga et al., 2011).
Mean decrement (dB) as a function of suppressor level, L 3 (dB SPL). f 2 = 1 kHz and L 2 = 30 dB SL. Each panel represents data for a different f 3. Open circles represent the mean difference in L d between control conditions and the conditions in which a suppressor was present. Error bars represent ±1 SD. Filled circles represent the decrements after they were transformed using Eq. (1) (see text). Lines represent best fits to the transformed decrements. The fits to the transformed data provided the estimate of slope and were solved for the L 3 resulting in 3 dB of suppression, which was then used to construct the STCs in a companion paper (Gorga et al., 2011).
Same as Fig. 4, only here f 2 = 5.6 kHz and L 2 = 30 dB SL.
Mean decrement (dB) as a function of suppressor level, L 3 (dB SPL). Data for a different f 2 are represented in each panel. Within each panel, data are shown for L 2 levels of 10, 30, and 50 dB SL, with the thinnest line representing data for the 10-dB SL condition and progressively heavier lines representing data for L 2 = 30 and 50 dB SL. In all panels, f 3 ≈ f 2 – 1 octave.
Same as Fig. 6, only here f 3 ≈ f 2.
Same as Fig. 6, only here f 3 ≈ f 2 + octave.
Slope of the decrement function as a function of f 3 in octaves relative to f 2. Data for a different f 2 are shown in each row and data for a different L 2 are shown in each column. Slopes are estimated from a SLR in which only L 3 was a variable.
(Color online) Slopes from multivariate linear regressions in which L 3 and L 2 were included. Left panel: f 3 is plotted on a log-frequency scale. Right panel: f 3 plotted on an octave frequency scale relative to f 2. Within each panel, the parameter is f 2. Open symbols represent slopes as a function of L 3, while filled symbols represent slopes as a function of L 2.
MeanSD and SDSD for the control conditions for all eight f 2 frequencies (kHz) and six L 2 levels (dB SL).
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