Hearing performance fluctuates predominantly at the electrical stimulation frequency rather than its harmonics

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. This observation was supported by a random-effects ANOVA including frequency as factor, which revealed a main effect of frequency on spectral magnitude (F(2,26) = 3.93, p = 0.032). — Dijk, Pim van, Physiology, Psychoacoustics and…, 4798