Amplitude-Intensity (A-I) curves for ABR wave P2 as functions of treatment group and test age. There was an age-related pattern whereby the ALC offspring had decreased amplitudes as PND22 pups, which largely dissipated by PND220 young adulthood, and then reappeared by PND520 middle-aged adulthood. Stimuli = 16 kHz tone pips. Group differences: *ALC < CON = PFC, #ALC < PFC, †ALC = PFC < CON, ‡ALC < PFC < CON.