FIG. 2.
ECAP growth curves and DPT levels for three cats. Each point represents the peak-to-peak ECAP amplitude evoked by an alternating, biphasic pulse presented at a rate of 15/s. In most animals, the DPT level (arrow) was chosen to be roughly 1 dB below the “knee,” where the ECAP growth curve begins to saturate. In animals where a knee was not apparent (e.g., lml13), DPT level was set at the highest stimulus level that did not evoke a facial twitch.