Figure 1 . Representation of the Target (Go) and Non-target
(No-go) stimuli used in the tasks and their durations.
The experimental session included three task conditions (Figure 2) all
requiring the keypress by the right index finger as a response. The
conditions were executed in separated randomly intermixed blocks. In the
simple Keypress condition , participants were seated in a
comfortable chair facing a desk with a response pad on top at 30 cm from
the body. They were asked to complete the DRT with minimal motor
involvement, with the right hand always placed on the response pad, they
had to press a green key just flexing the right index. In theReaching condition , participants were seated as in the
Keypress condition, but the response pad was positioned at 50-55
cm away from the body requiring a full arm extension to reach and press
the green key (i.e., long-range arm reaching movement). The response pad
distance varied based on the length of the participant’s arm. After the
keypress, the participant had to return to the resting position, with
both hands on the desk close to the body. In theReaching-Stepping condition , participants stood at 75-80
cm from a 130 cm tall pod with the response pad on top. They were
required to take a step and extend the right arm to reach and press the
green key and then come back in the rest position with the legs slightly
apart and the arms at the sides. The step consisted in bringing the
right leg forward, while the left one remained stationary.