The graph illustrates a shift from proportionally fewer individual difference studies early in the decade to a proportionally larger number of individual difference studies over the last several years. The blue line illustrates individual difference studies of the neural basis of executive control, while the red line illustrates such research not including individual difference terms (see below). The publication data were normalized by dividing the number of publications per year by the total number of publications (between 1999 and 2009) in each category.
Source: Scopus. Search used: (“individual differences” OR IQ OR PERSONALITY OR “individual variability”) AND (“cognitive control” OR “executive control” OR “working memory” OR “response inhibition” OR attention) AND (fMRI OR MRI OR ERP OR EEG OR PET OR MEG OR TMS)