IPLs demonstrated that the latency from wave I to III, wave I to IV, and wave I to V increased with age in females, but not males
IPL was calculated as the difference in latency from the wave I peak to the other designated peak for left and right ears at frequencies 8, 16, and 32 kHz. The average IPLs at 90 dB SPL are shown for specified ages of male DA rats (top panel) and female DA rats (bottom panel). Statistical analyses using two-way ANOVA and multiple comparisons with Dunnett’s test were performed. Data are displayed in a box and whisker plot using Tukey’s method to show Tukey outliers. The line within the box denotes the median, the edges (hinges) of the box show the 25th and 75th percentiles, and the whiskers show the 25th percentile minus (1.5 interquartile range) and 75th percentile plus (1.5 interquartile range). The level of significance was P<0.05, where *P<0.05, and **P<0.01.