Fig. 6.

Distractor population peristimulus time histogram during discrimination. A: population average firing rate in response to the task distractor was recorded under the No Task condition before each day's behavioral session and during that session. B: prestimulus firing rate was subtracted from each plot. C: evoked response 10 to 60 ms after tap onset was normalized to a sum of 1 and replotted to compare shape. D: cumulative sum of the normalized responses is plotted. An arrow indicates the location of the maximal difference between distributions used in the Kolmogorov-Smirnov test. A group of 113 paired recordings was used to make these plots.