Opposing functions of glutamatergic inputs between the globus pallidus external segment and substantia nigra pars reticulata.

STN and GPe neuronal activity increased when good objects were chosenSNr activity increased when rejecting bad objects and decreased when accepting good objectsExcitatory inputs inactivation in the GPe caused delayed saccade to good objectsExcitatory projection inhibition to the SNr suppressed involuntary saccade control.