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. Author manuscript; available in PMC: 2016 Jan 31.
Published in final edited form as: Exp Brain Res. 2014 Nov 16;233(2):671–677. doi: 10.1007/s00221-014-4146-z

Fig. 1.

Fig. 1

Effect of interstimulus interval (ISI) and intensity of subthreshold stimulus on motor evoked potential (MEP). The peak-to-peak amplitudes of MEP were shown. Dotted horizontal line marks the amplitude of MEP with at-threshold single pulse stimulation. The facilitation occurred as a function of ISI and intensity of the subthreshold stimuli. Compared with non-response at 70% resting motor threshold (RMT), some summation effects can been seen at ISI as far apart as 15 ms. However, compared with at-threshold single pulse stimulaiton, summation occured mainly at 1, 1.5 and 3 ms ISIs with the higher subthreshold stimulation, marked with ‘*’ (p<.05). Error bar indicates SE