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Mean number of error trials. Error decreased as a function of practice exposure (a) and stimulation during the retrieval of these sequences led to an interaction between stimulation site and sequence type (b), such that the MOD sequences were more sensitive to stimulation of the PMd and both the MOD and the EXT sequences were sensitive to the stimulation of the SMA. Shading reflects the model that included only the MOD and EXT. Error bars show SEM.
