Stroop interference in ACMs as a function of Trait NA (plotted over the observed range of trait NA on the x axis). Stroop interference = RTs of incongruent trials – RTs of congruent trials. NEG, negative ACM; NEU, neutral ACM; POS, positive ACM. Each color markers indicate the data points for the following ACMs: blue, negative ACM; green, neutral ACM; red, positive ACM.