Fig. 4.

Mean thresholds (represented on the Y-axis) for all six rats lumped into depth regions and averaged by days postimplant. The threshold, that is, the current amplitude for which the rat’s detection probability equaled 50%, is represented in terms of nC per phase, which is the product of the current amplitude and the duration of the first phase. The data represent the first month (31 days) after implantation. In the first week (days 1–7), thresholds tend to rise together. In the second week (days 8–14), thresholds tend to recover with deeper sites decreasing the most. In the final phase, thresholds tend to increase in the superficial sites, while thresholds at deep sites are relatively stable. Error bars show the standard error of the mean.