(A) Left panels: voltage responses to depolarizing and hyperpolarizing current step injection for three principal cells (top) and three non-principal cells (bottom). 0 ms corresponds to start of current injection. Colors indicate current amplitude (blue: most negative, red: most positive), and ranged respectively from (top to bottom): −2,000 to 2,000; −1,000 to 1,000; −1,000 to 1,000; −1,000 to 1,000; −500 to 500; −1,000 to 1,200 pA. The CF or BF, and cell numbers are indicated in the panel. Arrowhead (third row, left panel) indicates voltage sag indicative of Ih current that can be seen in all cell types. Right panels: spike dot rasters showing spike occurrences in the data in the left panels. (B) Stacked voltage responses to repetitions of short ipsilateral tones at or near CF/BF at one sound level, for the same cells as in A.