  The globus pallidus (GPe) of the basal ganglia has been underappreciated for
decades due to poor understanding of its cells and circuits. The advent of
molecular tools has sparked a resurgence in interest in the GPe. Here, we
review a recent flurry of publications that has unveiled the complexity of the
molecular landscape and cellular composition within the GPe. These discoveries
have revealed that GPe neurons display a number of circuit features that do not
conform to the traditional views of the basal ganglia. Consistent with its
broad interconnectivity across the brain, emerging evidence suggests that the
GPe plays multifaceted roles in both motor and non-motor functions. Altogether,
recent data highlight cellular and functional diversity within the GPe and
prompt new proposals for computational rules of the basal ganglia.
