1 Unité de Formation et de Recherche en Sciences et Techniques des Activités Physiques et Sportives,

Certain brain areas involved in interval timing are also important in motor activity. This raises the possibility that motor activity might influence interval timing. To test this hypothe-sis, we assessed interval timing in healthy adults following different types of training. The pre- and post-training tasks consisted of a button press in response to the presentation of a rhythmic visual stimulus. Alterations in temporal expectancy were evaluated by measuring response times. Training consisted of responding to the visual presentation of regularly ap-pearing stimuli by either: (1) pointing with a whole-body movement, (2) pointing only with the arm, (3) imagining pointing with a whole-body movement, (4) simply watching the stimu-lus presentation, (5) pointing with a whole-body movement in response to a target that ap-peared at irregular intervals (6) reading a newspaper. Participants performing a motor activity in response to the regular target showed significant improvements in judgment times compared to individuals with no associated motor activity. Individuals who only imag-ined pointing with a whole-body movement also showed significant improvements. No im-provements were observed in the group that trained with a motor response to an irregula