**Data Files** In the row.per.participant zipped folder, allds includes all the participants, allok includes all the participants who were not excluded, binok includes all the participants who were not excluded and completed the dichotomous racial categorization task, and spdok includes all the participants who were not excluded and completed the speeded four-choice racial categorization task. The row.per.participant.simple zipped folder includes only the variable relevant for the main analyses reported in the supplement materials. It includes an xlsx file which is the codebook that explains the variable names. allds.simple includes all the participants, allok,simple includes all the participants who were not excluded. The other four files are for each of the four sub-samples (based on the combination of RCB task and ST-IAT task completed by the participant. ---------- **Analysis scripts** The sas file is an early script created at about 2008 (when the study was conducted). The R file has been created earlier than the Rmd file, which is currently the last file created for processing and analyzing the data.