Fig. 2.

Firing rates and spike latencies in “no-adaptation” and “adaptation” blocks. A: peristimulus time histograms (rectangular window: 0.01 s; temporal resolution: 0.001 s) for tones in “no-adaptation” and “adaptation” blocks (thin lines, individual units; thick lines, median across units). Inset: firing rates (0.01–0.04 s) for individual tone frequencies in the “no-adaptation” block. Firing rates were significantly smaller for high compared with low frequencies relative to the unit's best frequency (P = 0.008). B: nonnormally distributed overall firing rates (0.01–0.04 s) and spike latencies. C: firing rates for each stimulus type (standards, small deviants, moderate deviants, and large deviants, irrespective of statistical context) compared with the physically identical stimulus in the “no-adaptation” block (gray lines, individual units, black lines, median across units). Bar graphs show the corresponding firing rate differences. *Significant difference from 0. D: similar to C for the latency of the first spike.