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. 2016 Aug 31;10:438. doi: 10.3389/fnhum.2016.00438

Figure 1.

Figure 1

Experimental setup (A), the discard threshold of the motor evoked potential (MEP) response in the left first dorsal interosseous (FDI) muscle (B) and time protocol of the test and conditioning stimuli in Experiments 1 (C) and 2 (D). The arrow in each coil indicates the direction of the electrical current in the brain (A). The deviation of the electromyographic (EMG) trace in the time window between 15 and 50 ms after the transcranial magnetic stimulation over the primary sensory area (S1-TMS) larger than 50 μV is considered to be the presence of the MEP response and the trials with the EMG trace larger than this size of the deviation are discarded from data analysis (B). MEP, motor evoked potential; FDI, first dorsal interosseous; S1, primary sensory area; TMS, transcranial magnetic stimulation; AP, anterior-posterior position; PA, posterior-anterior position; LM, lateral-medial position; DS, tactile stimulation to the index finger; M1, primary motor area; C-T interval, conditioning-testing interval; C-C interval, conditioning-conditioning interval.