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Choice reaction times (RTs) are often used as a proxy measure of typicality in semantic categorization studies. However, other item properties have been linked to choice RTs as well. We apply a tailored process model of choice RT to a speeded semantic categorization task in order to deconfound different sources of variability in RT. Our model is based on a diffusion model of choice RT, extended to include crossed random effects (of items and participants). This model retains the interestingdoi:10.1016/j.actpsy.2009.10.009 pmid:19962683 fatcat:p3vzq7v6ebhgtaekyziui7xnky