Figure 5. 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.

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)