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Effect of blue light in the PPT of Vgat-SNr-ChR2 mice on licking behavior. During the licking sessions, blue light was delivered (3 s OFF/3 s ON) in the PPT using trains of 1 ms pulses (40–66 Hz) at the same blue light power that blocked avoidance responses in each animal. The asterisks denote significant differences in licks between the light ON periods (six 0.5 s periods) and the last light OFF period immediately preceding the light ON in the sequence.
