Fig. 1.

A) Glass brain showing peak change in beta power between rest and grip in both the contralateral and ipsilateral M1 (grip was performed with the right hand — left hand grips were flipped in the sagittal plane so that all data could be included on the same plot) with each dot representing an individual. Results are displayed on a ‘glass brain’ and shown from above (left), from the right side (middle) and from behind (right). B) Group average time–frequency spectrogram showing the changes in power from 5 to 80 Hz across 1 trial comprising 1 s baseline, 3 s grip and 2 s post-grip. The colour indicates the percentage change in power from baseline at that frequency with red indicating high power and blue indicating low power. The decrease in beta power during the grip can be seen as well as the rebound following movement cessation.