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. Author manuscript; available in PMC: 2020 Oct 29.
Published in final edited form as: Neuroimage. 2020 Jun 13;220:117048. doi: 10.1016/j.neuroimage.2020.117048

Fig. 1. Neural Responses to Paired-Pulse Electrical Stimulation of the Left Median Nerve.

Fig. 1.

(Top Left): Grand-averaged time-frequency spectrogram of a MEG sensor near the sensorimotor cortices illustrating the somatosensory spectral responses to paired-pulse electrical stimulation with an inter-stimulus interval of 500 ms. Time is shown on the x-axis (ms) and frequency is denoted on the y-axis (Hz). All signal power is expressed as a percent change from baseline (−700 to −300 ms), with the corresponding color scale bar displayed below the graphic. (Right): Time-frequency spectrograms of the same MEG sensor illustrating the somatosensory responses at each of the tested inter-stimulus intervals (ISIs) ranging from 100 to 1000 ms, respectively. Note that all axes and scales are held constant across the time-frequency spectrograms. (Bottom Left): Grand-averaged beamformer images (pseudo-t) for stimulation 1 and stimulation 2 across all participants and ISIs. Strong increases in power were found in the contralateral hand region of the somatosensory cortex in virtually identical locations across both stimulations and all ISIs.