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Temporal relations between tic-related activity in the GPe and GPi. A, Timing of earliest tic-related activity in pairs of simultaneously recorded GPe and GPi neurons. B, Distribution of time differences between tic-related activities of GPe relative to GPi simultaneously recorded neurons. Filled and open icons indicate pairs in which the tic-related activity of the GPe neuron was before or after tic-related activity in the GPi neuron, respectively.
