FIGURE 2.

Loss and Progressive Recovery of VsEP Responses After Intense Noise Exposure. Lowermost traces: Five head jerk stimulus intensities were used to produce VsEP responses. Representative results for one animal are shown. Uppermost traces: Pre-exposure VsEPs. In an intact animal, two distinct waveforms are identified as P1N1 and P2N2. After exposure to intense noise, the VsEP is abolished at the lowest intensity and is severely attenuated at larger intensities immediately after noise exposure (1 DPN [day post-noise], 2^nd row). Minimal improvement can be observed at 7 DPN (3^rd row); however, the changes in postnoise VsEP amplitudes were not statistically significant (see Fig. 3). Scale bars represent 0.2 μV (VsEP), 2 g/ms (jerk stimuli), and 2 ms (time base).