Recently, we have investigated corticomuscular coherence (CMC) in a visuomotor task and showed for the first time gamma-range (30-45 Hz) CMC during isometric compensation of a periodically modulated dynamic force (Omlor et al. 2007). We speculated that for the control of such forces the sensorimotor system resonates at gamma-range frequencies to rapidly integrate the visual and proprioceptive information and produce the appropriate motor command. In the present study, we tested the role of the proprioceptive afferent feedback on gamma-range CMC by comparing the deafferented patient GL to six age- and gender-matched subjects during the performance of a finger visuomotor force task consisting in isometric compensation of static and dynamic forces applied on the finger. The patient GL presented no significant gamma-band CMC during dynamic force. Instead, she had only beta-range CMC as in the static force condition, concurrently her performance was significantly worst than that of the controls in both conditions. This gives support to the conclusions of our previous paper and suggests that proprioceptive information is mandatory in the genesis of gamma-band CMC during the generation and control of dynamic forces.