Figure 1
(a) Schematic depiction of the Monetary Incentive Flanker Task. Participants were instructed to respond with the left or right button according to the direction of the middle arrow. In the potential gain (PG) context, the 80% fastest correct responses were rewarded (1a), in the loss avoidance context, the 80% fastest correct responses were not punished (2a). Incorrect and the 20% slowest correct responses were either not rewarded (1b), or punished (2b). Logistic regression on accuracy (b) and multiple single-trial regressions on RT (c) were used to assess behavioral effects in the task, controlling for confounding variables and the interdependence of effects. Interference effects are reduced after errors with regard to accuracy (d). Motivational context predicted RT, in that the loss context increased accuracy, as participants only showed post-error increase in accuracy (PIA) within the PG context (e), as well as RT (f). Stimulus incongruence decreased accuracy and increased RT, and interacted with accuracy (g). b, c depict mean within participant t-values, p-values are derived from t-tests of individual regression weights against zero and were Bonferroni corrected. RT is calculated as the mean of within-participants median RTs per condition. For b, c, boxes = interquartile range (IQR), − = median, whiskers = 1.5 × IQR, gray dots = outlier. For d–g, error bars represent the standard error of the mean. See Supplementary Table 1 for descriptive statistics of behavioral data.
