Abstract

A model aimed at explaining asymmetries in the Simon effect is presented. It is based on neuropsychological and neurophysiological data about lateralization of processes related to the response selection stage. Predictions about asymmetries one should expect when subjects perform a Simon task by executing responses only with one hand are derived from the model, and an experiment is carried out to test these predictions. Data confirm the assumption that Simon effect asymmetries are due to the different hemispheric patterns of activation for response selection.