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Gepubliceerd in: Psychological Research 3/2023

16-06-2022 | Original Article

Evaluating individual differences in rewarded Stroop performance: reliability and associations with self-report measures

Auteurs: Brent Pitchford, Karen M. Arnell

Gepubliceerd in: Psychological Research | Uitgave 3/2023

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Abstract

In three separate experiments, we examined the reliability of and relationships between self-report measures and behavioral response time measures of reward sensitivity. Using a rewarded-Stroop task we showed that reward-associated, but task-irrelevant, information interfered with task performance (MIRA) in all three experiments, but individual differences in MIRA were unreliable both within-session and over a period of approximately 4 weeks, providing clear evidence that it is not a good individual differences measure. In contrast, when the task-relevant information was rewarded, individual differences in performance benefits were remarkably reliable, even when examining performance one year later, and with a different version of a rewarded Stroop task. Despite the high reliability of the behavioral measure of reward responsiveness, behavioral reward responsiveness was not associated with self-reported reward responsiveness scores using validated questionnaires but was associated with greater self-reported self-control. Results are discussed in terms of what is actually being measured in the rewarded Stroop task.
Voetnoten
1
Only two of the conditions are included in the calculation of MIRA and the smaller number of trials per participant might have led to artificially reduced reliability for MIRA relative to the reward responsiveness measure that contains many more trials. To test this, separate correlations were conducted with a modified reward responsiveness measure that only included average RTs from two conditions: RTs to no-reward trials where the Stroop condition was incongruent, and the word was not associated with reward minus RTs to potential-reward trials where the Stroop condition was incongruent, and the word was not associated with reward. This allowed for the same number of trials to be included in the reward responsiveness and MIRA measures. In all experiments, reward responsiveness reliabilities remained remarkably high and consistent despite the reduced number of trials. Therefore, the lower reliability for the MIRA measure relative to the reward responsiveness measure is not simply a result of the fewer number of trials per participant.
 
2
One alternative method to calculating difference scores is the residualized measure approach. To calculate the residualized MIRA measure, the same conditions were included where the average RTs when the word was reward-unrelated was regressed on average RTs when the word was reward-related, and the standardized residuals were saved for further analyses. Correlations between original and residualized MIRA measures were very high (r’s > .87), and reliabilities for the residualized MIRA measure remained poor in all experiments.
 
Literatuur
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Metagegevens
Titel
Evaluating individual differences in rewarded Stroop performance: reliability and associations with self-report measures
Auteurs
Brent Pitchford
Karen M. Arnell
Publicatiedatum
16-06-2022
Uitgeverij
Springer Berlin Heidelberg
Gepubliceerd in
Psychological Research / Uitgave 3/2023
Print ISSN: 0340-0727
Elektronisch ISSN: 1430-2772
DOI
https://doi.org/10.1007/s00426-022-01689-5

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