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. Author manuscript; available in PMC: 2011 Jan 1.
Published in final edited form as: Neuropsychologia. 2009 Oct 29;48(2):541. doi: 10.1016/j.neuropsychologia.2009.10.015

Figure 2.

Figure 2

Experimental setup and procedure. A. Response boxes. Keypads were positioned vertically to utilize first dorsal interosseous (FDI) muscle of the index finger for making key press responses. The FDI muscle is well isolated and can be recorded using electromyography (EMG) with little interference from other muscles. Subjects responded by making key presses with either a lateral movement from both index fingers or a downward movement with both little fingers. B. Trial design for Experiment 2. On each trial a TMS stimulus was delivered. It could be delivered at any of four possible time-points; in the intertrial interval (ITI), or in the foreknowledge interval 800, 500 or 200 ms before the go stimulus. C. Trial sequence procedure. The cue was constant for four trials in a row (experiment 1) and twelve trials in a row (experiment 2). A message “Cue is changing to ‘Maybe Stop Left” (MSL) was presented. The order of cues was randomized. Feedback was provided to the participant after each block of 72 trials.