Four-hundred-twenty-seven healthy subjects completed the Adult Temperament Questionnaires and the Attention Network Task-revised (ANT-R), a conflict resolution task that gauges EA as the Flanker Effect (FE), i.e., the difference in performances between incongruent and congruent trials. Employing a Drift Diffusion Model (fastdm) we computed the drift rate and the extra-decisional time for congrunet and incongruent trial separately. We hypothesise that the decisional process measured as the drift rate in the incongruent trials but not the FE is associated with the temperamental dimension of self-regulation, namely the effortful control.
Steps to reproduce
Each individual was tested with the ANT-R (Fan et al. 2009) and filled the ATQ (Evans & Rothbart, 2007). Each experiment includes 288 trials. Trials were divided in congruent (n=144) and incongruent (n=144). On each subset, for each paticipant, we applied a drift diffusion model with fast-dm with the following script method ks set p 0 set zr p=.5 format TIME RESPONSE load *ant-atq.dat log results.log Among the resulting parameters we first explored the correlations between drift rate and extradecisional times and the temperamental dimensions at ATQ (neagative affectivity, extroversion and effortful control). The validity of the model has been also tested comparing the parameters with the standard scores (Flanker Effect). The standard score was computed in e-prime as follows FE= RT incongruent - RT congruent In a second moment in SPSS we also computed a new corrected score to account for the inter-individual variability in RT as follows: FEc= FE/mean RT.