Texture-specific spike counts. A, Cortical activity during five successive trials on two textures, CD (black) and P280 (gray). The scale under the bottom panel indicates the time from stimulus onset until T over which cumulative spike counts can be computed. B, Left, Distribution of whole-whisk spike counts measured from 100 presentations of CD (black) and P280 (gray). Right, Conditional probabilities of the two stimuli of interest given an observed value of spike count.