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. Author manuscript; available in PMC: 2017 Apr 1.
Published in final edited form as: Pain. 2017 Apr;158(4):691–697. doi: 10.1097/j.pain.0000000000000816

Figure 4.

Figure 4

Steady-state visual-evoked potentials. Steady-state visual-evoked potentials (SS-VEPs) elicited by concomitant periodic visual stimulation of the HFS arm and control arm at 7 Hz or 9 Hz. The frequency of the stimulation applied onto the HFS arm or the control arm was balanced across participants. Contrary to the N1 wave of visual-evoked potentials, HFS did not appear to exert any significant effect on the magnitude of the SS-VEPs, whose scalp topographies were maximal over occipital regions.