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Stimulus (S)-locked and response (R)-locked grandaverages of electromyographic activity in the responding arm for each combination of mapping and precue type. WS, warning signal; PC, precue; RS, response signal; RT, reaction time; U/D, up/down precues; I/O, in/out precues; Alt, precues with alternating rows; and NI, noninformative precues.
