Coherence in the alpha band during isometric contractions and contractions against the spring. 5A) Dots indicate the cortico-muscular coherence peak value for each volunteer, obtained from the EMG and the EEG sensor pair with the highest reported value of alpha band coherence during contractions against the spring.

<p>In this graph, when coherence was below significance level, coherence values were reported equal to “0”. 5B) Group average maximal peak coherence across 6 EEG channels in the alpha and beta bands during isometric contractions and contractions against the spring. *Condition effect p<.05; ‡ Interaction effect p<.05 (Two way ANOVA for repeated measures)