Figure Box 1.

Basal ganglia circuit that supports object skill. Neurons in the monkey CDt receives inputs from the temporal visual cortices and respond to visual objects differentially. Their responses are modulated by the stable (not flexible) values of the visual objects. Neurons in the SNr, which receive inputs from the CDt directly or indirectly, categorize visual objects into high- and low-valued objects. Their stable value signals are then sent to the SC, thereby biasing gaze toward high-valued objects. Arrows indicate excitatory connections (or effects). Lines with circular dots indicate inhibitory connections. Solid and hatched lines indicate direct and indirect connections, respectively.