Test-retest reliability of a new delay aversion task and executive function measures

Despite the wide adoption of measures of executive functions and motivation al tendencies in studies of developmental disorders and child psychopatholo gy, few studies have investigated their test-retest reliability. The presen t paper examines the reliability of a new measure of delay aversion, three measures of working memory, a response inhibition measure and a measure of dual task performance. The children, aged between 7 and 15 years, performed the tasks twice, with a 2-week period in between the sessions. Using a rel atively conservative criterion, only the delay aversion task and one of the working memory measures (delayed response alternation) demonstrated satisf actory test-retest reliability. The other two working memory measures (sent ence span and counting span) showed modest reliability. For the inhibition measure (stop task) the results were mixed, with poor to modest reliabiliti es obtained for the various derived measures. The dual task failed to demon strate adequate test-retest reliability. These differential reliabilities n eed to be borne in mind when interpreting the results of studies using thes e measures. In particular the effect of low reliability on statistical powe r and the Type II error rate should be considered.