Video 1. A representative movie for a ChR2-stimulated mouse that was still capable of moving its head as a sign of attentive behavior towards its surroundings, while all four limbs remained largely immobile.

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The video shows the time window from 1 min before the onset of light stimulation, 5 min of light stimulation, and 1 min following light stimulation offset. The time window of light stimulation is marked by the ‘Light on’ indicator on the top right. The video is played at 5 x of the recording speed.