Fig. 1.

Trial-by-trial procedure. Following a 500-ms interval over the start position, the target appeared with or without an obstacle to trigger the participant to physically execute or mentally imagine themselves aiming (trial n-1). Upon movement termination, the previous objects disappeared and following another 500-ms interval, then a new target with or without an obstacle appeared to trigger participants to physically execute aiming (trial n). The present example illustrates an O-N trial pair involving execution in both trial n-1 and trial n