Phase-induced detection differences cycle predominantly at the stimulation frequency itself.

Evidence

While frequency bins centered on the higher harmonics (8 and 12 Hz) could explain a significant proportion of the overall variance in the series, this variance was explained best by a 4-Hz sinusoid; thus the phase-induced differences cycled predominantly at the tACS frequency. — Dijk, Pim van, Physiology, Psychoacoustics and…, 4798