Figure 2.

Effects of tACS on action selection duration. A, B, The four bars represent the effects of tACS on the duration of selecting an action (relative to no tACS, in z-scores) for the different stimulation conditions: stimulation of the contralateral (pink) or ipsilateral (blue) sensorimotor cortex at either alpha (10 Hz) or beta frequency (20 Hz), for high- and low- demand trials. During high-demand trials, action selection was faster when the sensorimotor cortex ipsilateral to the grasping hand was stimulated at 10 Hz. Asterisks indicate the significant post hoc paired-sample t tests (alpha-ipsilateral vs alpha-contralateral, t₍₃₂₎ = 2.2, p < 0.05; alpha-ipsilateral vs beta-ipsilateral, t₍₃₂₎ = 2.8, p < 0.01). C, D, Changes in oscillatory power relative to a prestimulus baseline period recorded using MEG (Brinkman et al., 2014) in an independent group of participants performing the same task with a delayed manual response (same conventions as in A, B).