Fig. S2.

Dopaminergic neurons do not reliably represent the termination of brief movements, but SNc neurons represent the onset of longer movements. (A) Mean normalized PETHs ± SEM aligned to the end of each movement period (gray shading) for SNc, VTA, or SNL neurons show that, on average, these types of dopaminergic neurons do not alter their firing rates significantly at the end of movement (n = 15 SNc neurons, 14 VTA neurons, and 5 SNL neurons). (B) Mean normalized PETHs ± SEM aligned to the start of each movement for a set of SNc neurons (n = 5) that were recorded during both brief (Left) and longer (Right) movements. Note that the decreased firing of these neurons that occurred at the onset of brief movements also occurred at the onset of the long movements. Data for long-duration movements were pooled across neurons (13 movements, mean duration 35.87 ± 6.55 s).