Figure 5.

Increased correlation coefficient across hippocampal CA1 with cerebellar stimulation. a, Example absolute value correlation coefficient matrices of active cells during a 1 s period before, during, and after a light stimulus (pre, stim, and post, respectively) in a control (top), simplex-stimulated (middle), or vermis-stimulated animal (bottom). Each cell is represented on the x and y axis. Diagonal indicates autocorrelation. Hotter colors represent higher correlation levels, as shown by the scale bar on the right. b, Plot of changes to global correlation coefficient relative to prestimulus correlation levels. Blue box represents stimulus period. Breaks in x axis come from 1 s moving window to calculate the correlation coefficient. Shading represents SEM. c, d, Mean changes to correlation measures during the stimulus period (c) or poststimulus period (d). Both simplex and vermis stimulation resulted in increased correlation during the stimulus period (c). Correlation measures also strongly increased following light delivery to the vermis (d). *p < 0.01 (Mann–Whitney). CTRL, Control; S, simplex; V, vermis.