Figure 7. Exposure to both types of AAE improve mean gap thresholds (MGTs) in phasic units. MGTs were computed across each group, for each noise carrier level (80, 70, and 60 dB SPL). A, At the 80 dB SPL carrier level exposure to both types of AAE resulted in shorter mean MGT (control: 15.0 ± 1.1 ms, regular AAE: 10.1 ± 0.9, T-AAE: 8.4 ± 0.7 ms). B, At the 70 dB SPL carrier level, exposure to both types of AAE again shorten mean MGT, with greater improvement seen in the T-AAE exposure group (control: 20.8 ± 1.5 ms, regular AAE: 15.7 ± 1.0, T-AAE: 12.7 ± 1.0 ms). C, At the 60 dB SPL carrier level, the mean MGT from the T-AAE group was significantly shorter than from the regular AAE group (15.9 ± 1.2 vs 23.3 ± 1.6 ms, p < 0.01). Additionally, the mean MGT for control mice was significantly shorter than from the regular AAE group (18.6 ± 1.7 vs 23.3 ± 1.6 ms), but the number of responsive units was much less. Sample size is shown inside the bar, with the percent shown as a percent of all phasic responsive units to an 80 dB SPL carrier. Asterisks denote a significant difference between regular or T-AAE and controls, **p < 0.01, ***p < 0.001.