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Basal ganglia circuits for object choice (A) and action choice (B). A: CDt circuit (same as Figure 2). B: Hypothetical circuits for choosing action X while suppressing action Y. pre-SMA: pre-supplementary motor area. STN: subthalamic nucleus. GPi: globus pallidus internus. Black and white circles at line end (i.e., axon terminal) indicate inhibitory and excitatory connections, respectively.
