This study examined the effect on spinal nerve function of differences in the motor imagery method. A total of 20 healthy volunteers (11 males and 9 females; mean age, 24 years) participated in the study. We recorded the F-wave of three different methods of motor imagery described in previous research: two single images of vision image and muscle image, and one composite image. Vision imagery is the method in which subjects image the digital digits to display pinch force. Muscle imagery is the

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... ethod in which subjects image the muscle contraction during pinching. Composite imagery is the method in which subjects simultaneously image the vision image and muscle image. F-wave analysis items were the F/M amplitude ratio, persistence and latency. F/M amplitude ratios of motor imagery under composite imagery were signifi cantly higher than that observed at rest. A signifi cant difference was noted in the relative data of the amplitude ratio of F/M between the muscle image and the composite image. Motor imagery under composite imagery was signifi cantly higher than those of the two single images of vision image and muscle image.