Practice-related changes in the slope coefficients of the linear regression equations between the TMS-induced responses of the dominant hand and force produced by the non-dominant hand. Force responses in the task fingers (kF,T) and in the non-task fingers (kF,NT) were analyzed separately. The EMG responses are reflected by the kMEP index. Note a significant drop with practice of kMEP and kF,T, but not of kF,NT. Averaged across subjects data are shown with standard error bars.