To determine whether our alpha-gamma PAC results were driven by differences in the sinusoidal properties of oscillations between baseline and grating periods, the ratio between oscillatory rise-time and decay-time was calculated. For the alpha phase frequencies (7–13 Hz), there was no difference in this ratio (all frequencies p > 0.05), suggesting that our results are unlikely to be caused by increased non-sinusoidal sawtooth-like properties of alpha oscillations during stimulus period compared to baseline.
