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Changes in GPi neuron responses after selective ablation of the hyperdirect pathway. Examples of PSTHs (bin width of 1 ms, summed for 100 stimulus trials) before (Pre-Injection) and after (Post-Injection) immunotoxin (IT) injections into the supplementary motor area (SMA). Electrical stimulation in the SMA was given at time = 0. Note that the early excitation is diminished without either the inhibition or the late excitation affected.
