Figure 1: Slow-wave activity is synchronized between the two hemispheres.

(a) Examples of baseline activity in the urethane anesthetized mouse in the two hemispheres (black line: Hem 1, gray line: Hem 2). (b) Magnification of a single up state recorded simultaneously in both hemispheres. (c) The distribution of lag times between the middle point of up states in the two hemispheres (dashed lines: single animals; continuous line: average), compared to the distributions obtained after randomly shuffling up states sequence in Hem 2 (green traces). The shuffling returns a far more dispersed distribution indicating the correlation between the two hemispheres.