Table 3. MEP amplitudes and values of RMT, SICI, and SAI obtained for the ECR and FCR muscles before and after probabilistic reward tasks.

	FCR muscle (mV)
	10% reward probability			50% reward probability			90% reward probability
	Before	After	P*	Before	After	P*	Before	After	P*
RMT (%)	50.3±5.1	49.0±5.4	0.072	50.0±5.6	48.9±4.9	0.301	49.6±5.6	49.1±5.4	0.590
MEP (mV)	0.28±0.01	0.33±0.01	0.260	0.27±0.01	0.23±0.01	0.115	0.29±0.01	0.29±0.01	0.816
SICI (conditioned/test MEP)	0.48±0.02	0.75±0.02	0.008	0.44±0.02	0.50±0.03	0.314	0.51±0.02	0.51±0.04	0.954
SAI (conditioned/test MEP)	0.76±0.02	0.68±0.04	0.238	0.90±0.03	0.84±0.12	0.720	0.72±0.02	0.73±0.02	0.884

Values are mean ± standard error of the mean. MEP, motor-evoked potential; ECR, extensor carpi radialis; FCR, flexor carpi radialis; RMT, resting motor threshold; SICI, short-interval intracortical inhibition; SAI, short-latency afferent inhibition.

*Differences in MEP amplitudes before and after probabilistic reward task were analyzed by paired t-tests.