Figure 4. Sound-evoked whole-nerve compound action potential (CAP) amplitude was determined prior to acoustic overstimulation (Le Prell et al., 2001b, Le Prell et al., 2003) and after exposure to a 110-dB SPL 10-kHz tone for 20-min (Le Prell et al., 2001b). Normalized CAP amplitude (i.e., relative to baseline) is depicted immediately post-exposure (left) and 90-min post-exposure (right). A normalized amplitude of 1.0 indicates that CAP amplitude post-exposure was equivalent to that assessed pre-exposure. Decreasing values indicate CAP amplitude was depressed post-exposure.