An illustration of a single trial sequence in Experiment 1b for both intentional releasing and pressing condition.

<p>A) A black square appears on screen after participants hold down the “F” key, upon releasing the “F” key, the black square would immediately disappear. After a blank screen lasting 450, 650, 850, or 1050 ms, a red square is presented, the subject then completed the time estimation task by clicking anywhere on the time scale. B) An illustration of a trial sequence for intentional pressing condition is depicted.