Task-specific modulation of effective connectivity during two simple unimanual motor tasks: A 122-channel EEG study

► Modulation of coupling in a core motor network is studied during two motor tasks. ► Bayesian model selection favors a model including within- and cross-frequency coupling. ► γ-γ and θ-γ band coupling is predominant during fast phasic movements of right index. ► During an isometric contraction of the right forearm β-β coupling is predominant. ► Changes in coupling show task-specific spatial distribution within the motor network.