<p>The aim of the study reported here was to identify the characteristics of myographic signals in stroke patients at rest and during motor imagery. In addition to the encephalogram, electromyograms were recorded in the projection of the elbow flexor muscles of the right and left arms. Electromyogram amplitude and the directed transfer function, which characterizes the strength of corticomuscular connections, were assessed. The experimental protocol included three conditions: rest, motor imagery of opening of the left hand, and motor imagery of opening of the right hand. Corticomuscular coherence in patients was greatest in the low-frequency ranges across all conditions. In the paretic arm, electromyogram amplitude and the directed transfer function were greater both at rest and during motor imagery. Afferent connections (from muscles to the cortex) in the paretic limb were predominant over efferent connections (from the cortex to muscles). During the transition from rest to motor imagery, the transfer function between the cortex and muscles of the paretic arm increased. During therapy, the strength of efferent and afferent connections increased significantly; EMG amplitude tended to decrease.</p>