Phase-induced hearing changes cycle predominantly at the tACS stimulation frequency

Evidence

Figure 2c shows the magnitude spectrum of the series. 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). Post-hoc paired t-tests showed that the 4-Hz bin was significantly stronger than the 12-Hz bin (t(13) = 2.65, corrected p = 0.020) but not the 8-Hz bin. — Dijk, Pim van, Physiology, Psychoacoustics and…, 4805