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The purpose of the study is closer investigating the nature of the response codes that are (automatically) activated by the physical size of visual stimuli. Previous research has demonstrated a compatibility effect between physical stimulus size and left vs. right response positions. In particular, participants respond faster and more accurate with a left-hand response to small/er stimuli than to large/r stimuli, whereas the opposite is true for right-hand responses. This physical stimulus size - response position compatibility effect occurs not only when stimulus size is task-relevant, but also when it is irrelevant, suggesting that stimulus size can activate the associated response in an automatic manner. Notably, in previous studies, participants always responded bimanually, that is, participants pressed a left key with one (usually the left) hand, and a right key with the other (usually the right) hand. In the present study, we want to determine whether the effect can also occur with unimanual responses, performed either with the left or right hand, and whether there are differences between the unimanual conditions. Therefore, participants will respond to a small or a large stimulus with three different response sets (unimanual left, bimanual, unimanual right). With each response set, participants will respond with a compatible S-R mapping (small-left, large-right) and with an incompatible mapping (small-right, large-left), to determine the size of the compatibility effect for each response set (and participant).