Representative examples of spontaneous high-voltage spindles (HVSs) recorded with ECoG in the M1, and LFP in the GP of saline-treated rats (A) and raclopride-treated rats (B).

In saline-treated rats, paroxysmal HVS activities were prominent in the GP area and to a small extent in the M1 cortex. In raclopride-treated rats, paroxysmal HVS activities were prominent in both the M1 cortex and the GP. The HVS episodes were longer and the power was greater following the injection of raclopride. ECoG, electrocorticogram; M1, primary motor cortex; LFP, local-field potential; GP, globus pallidus.