Assessing the validity evidence for habit measures based on time pressure.

Area of Science:

• Cognitive Psychology
• Neuroscience
• Behavioral Science

Background:

• Repeatedly rewarded actions can become habits in animals, but human habit formation is less understood.
• Existing human research on habit formation has yielded inconsistent results.
• Two key paradigms, the forced-response task and the outcome-devaluation task, are used to study habit formation in humans.

Purpose of the Study:

• To replicate and examine the reliability and convergent validity of two distinct measures of habitual control in humans.
• To investigate whether the forced-response task and outcome-devaluation task capture similar or distinct aspects of habit formation.
• To assess the stability of individual differences in habitual control.

Main Methods:

• Participants underwent four days of training in both the forced-response task and the outcome-devaluation task.
• Habitualization was assessed by measuring response persistence in the forced-response task and reaction time switch costs in the outcome-devaluation task.
• Reliability and convergent validity of the two measures were statistically evaluated.

Main Results:

• Previous findings were replicated in the forced-response task, showing persistent trained responses.
• In the outcome-devaluation task, a loss of response speed advantage was observed, consistent with habit formation.
• Both measures demonstrated good reliability, but showed no association, failing to provide evidence of convergent validity.

Conclusions:

• The forced-response task and outcome-devaluation task are reliable measures of habitual control but capture distinct constructs.
• Current measures may assess different facets of the habitual versus goal-directed control balance.
• Further research is needed to establish the construct validity and reliability of human habit measures.