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Neuronal response in the GPi after a cortical stimulation in the normal state (D = 100%). At t = 100 ms, a brief excitatory stimulation, lasting 5 ms, is applied to the cortex. From top to bottom, population activity averaged over 20 neurons in GPi, PETH of one GPi neuron aligned on the cortical stimulation (30 repetitions), and the corresponding raster plots are shown. The response of the GPi is triphasic.
