Figure 3.

Comparison of discharge frequency of pyramidal cells in two successive SWS episodes, interrupted by either a wheel-running session (A, familiar) or novel exploration (C, novel). Wheel cells (filled gray circles) are shown separately in A. (B and D) Mean correlation values for sleep before vs. sleep after (S_B-S_A), awake vs. sleep before (A-S_B), and awake vs. sleep after (A-S_A) sessions in the well trained running-wheel task (B) and in the novel environment (D). Note high and low correlations between successive sleep sessions in the familiar and novel environments, respectively.