Fig. 2.

A) Significant positive correlation (R = 0.64, p = 0.00008) between contralateral M1 baseline beta power and age across the control group (n = 32). B) Ipsilateral M1 baseline beta power against age, this correlation was not significant but did show a trend (R = 0.35, p = 0.06). C) Contralateral M1 peak beta frequency at rest against age, this correlation did not reach significance (R = − 0.31, p = 0.09). D) Ipsilateral M1 peak beta frequency at rest against age, this correlation was not significant (R = 0.05, p = 0.79).