FIG. 12.

Detect ability (A) and discriminability (B) of a tone in noise for a high-SR fiber with a CF of 8 kHz as a function of tone level for the 2009 AN model with power-law adaptation (solid red line) (Zilany et al. 2009). Dotted blue lines indicate the original 2006 Zilany and Bruce model with no gain reduction, while physiological data (Kawase et al. 1993) are shown as red triangles. Stimulation with ipsilateral noise occurred at the specified level (10–30 dB SL) as indicated above each panel. The inability of the 2009 model to fit the data much better than the 2006 model without MOCR feedback suggests that power-law dynamics alone cannot account for AN tone-in-noise data and that OHC gain reduction to simulate the MOCR is needed.