Table 1

Standardized verbal instruction given during the experiment

TimepointInstruction
After baseline (BL) blockThe goal of this study is to investigate the so-called mirror activity phenomenon. That means that every time you perform a contraction with one hand, we can also measure a weak activity in the contralateral resting hand. From now on, please try to suppress this involuntary activity as much as possible by a self-chosen strategy. However, keep the performance of the left hand identical.
After each consecutive blockGood job. However, we still see some involuntary muscle activity in your resting right hand. In the following block, please try to suppress this involuntary activity again as much as possible.