FIG. 7.

Detectability improved with outer hair cell (OHC) gain reduction as in Figure 6, but shown here for all spontaneous rate (SR) groups and for higher noise levels. Detectability (d') for a tone in noise for high-SR (top row), medium-SR (middle row), and low-SR (bottom row) fibers with a characteristic frequency of 8 kHz. Different thicknesses represent different amounts of OHC gain reduction in 10 dB steps. Increasing noise levels (in dB SL) are shown above the panels. Horizontal dotted line (d' = 1) represents detection threshold. Insets with a magnified scale show that the same effects occur (albeit smaller) when fibers are near saturation.