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Description: An increasing number of behavioural studies have described interactions between number processing and the hand action of reaching and grasping objects, suggesting overlapping mechanisms between the mental representation of number magnitude and the one of the hand. In this study we will explore the effects of repetitive hand action on a digit magnitude comparison task (number comparison with internal reference 5). In line with fMRI studies on human grasping describing distinct processes for reaching and grasping, we will evaluate the specific effects of reaching and grasping on number magnitude comparison. In this experiment, participants will be required to perform repetitive grasping (Action I), repetitive pointing (Action II), repetitive hand tapping (Action III) or no action, prior to number comparison. The different effects of conditions on number processing will be evaluated.