Fig. 2.

Threshold distributions for AN fibers in three populations. Thresholds from tuning curves are plotted versus BF for all AN fibers for which 2-kHz tone rate functions were collected. Tuning curve thresholds were defined as the minimum level necessary to induce an increase of 20 spikes/s in response to a 50-ms tone. The line (NBTC) shows minimum thresholds in normal animals from our supplier. Normal animals are unexposed; mild and moderate populations received the noise exposure described in the text. Tuning curve widths (Q10s) are shown in the original paper (Heinz and Young 2004); they were depressed at BFs with large threshold shifts, especially in the moderate loss group.