In the frontal left region, theta mean power tended to be lower after the cues coupled with tACS ( F 1,14 = 4.28, p = 0.057, η 2 = 0.23), while the difference was highly significant in the frontal right region ( F 1,14 = 9.57, p = 0.008, η 2 = 0.41).
The change between cycle 1 and cycle 2 only approached significance in the beta frequency band (cycle × group interaction: F 1,35 = 3.78, p = 0.060, η 2 = 0.10; see Supplementary Table S2 ). 3.
However, in the continuous group, there was a statistical trend for a negative cluster in the control-tACS condition: 1.92–2.26 s after cue onset at 4 Hz ( p = 0.079) in the frontal region, theta power was lower for Hits compared to Misses ( t 16 = 2.67, p = 0.017, d = 0.89; see Figure 3 E).