MEPs amplitudes during the holding conditions with imagery of the pincer grip.
(A) An average of 20 trials of MEPs recorded in the FDI during the Pinching Posture (PP), Pinching Posture with a smaller ball (PP+Ball), Holding Posture (HP) and Holding Posture with a larger ball (HP+Ball) conditions. The gray zones indicate ±1 SD. (B) The MEP amplitudes during imagery of the pincer grip in the FDI in four conditions for 12 subjects. Two-way ANOVA revealed main effects of object (hold or not-hold) (p<0.05) and Posture (pinching or holding) (p<0.05). The MEP amplitudes in the PP+Ball condition were significantly greater than those of the PP condition (p<0.05) and the HP+Ball condition was significantly greater than that of the HP condition (p<0.05). (C) The facilitation index did not differ between the two postures (p>0.05).