FIG. 3.

Responses of MI neurons to repeated mechanical deflections of the contralateral whiskers. A: PSTHs of neurons encountered at specific depths in a single penetration through MI cortex. Multiple whiskers were deflected simultaneously at 2, 5, and 8 Hz as indicated by horizontal bars. Trials: 100; bin widths: 10 ms; waveform scales: 500 μV, 1 ms. B: mean population response produced by each stimulus cycle as a function of cortical depth and stimulus frequency. The responses to the first stimulus in the 2-, 5-, and 8-Hz sequences were grouped together to calculate the mean responses for 0.5–1 Hz; mean responses shown at 2, 5, and 8 Hz represent the effects of the last 7 stimuli in each block of frequencies. Stimulus duration indicated by the sawtooth profile below each PSTH. Bin widths: 5 ms.