Figure 2.

Behavioral GDTs are worsened by early hearing loss, and remediated to control levels by stimulus exposure. A, GDTs for each animal over each of three sessions. B, Best GDT per animal across all tested sessions. Across all sessions and for each animal's best session, earplugged animals had higher thresholds than controls (left, EPSil vs CtSil). Stimulus exposure improved thresholds (EPSil vs EPGap), and these remediated thresholds were as low as those of controls (CtSil vs EPGap). In non-EP animals, gap exposure reduced the variability of detection thresholds due to fewer animals with high thresholds (CtSil vs CtGap). Wide blue bars, Medians across three sessions for each group. Thin blue bars, Median for each session or group. NT indicates that the longest gap presented (30 ms) was not detected. Planned comparisons, ***p < 0.0002; unequal variance, ^♢p < 0.005.