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Reliability of triggering inhibitory process is a better predictor of impulsivity than SSRT

Skippen, P, Matzke, D, Heathcote, A ORCID: 0000-0003-4324-5537, Fulham, WR, Michie, P and Karayanidis, F 2019 , 'Reliability of triggering inhibitory process is a better predictor of impulsivity than SSRT' , Acta Psychologica: International Journal of Psychonomics, vol. 192 , pp. 104-117 , doi: 10.1016/j.actpsy.2018.10.016.

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Abstract

The ability to control behaviour is thought to rely on adequately suppressing impulsive responses toexternal stimuli. However, the evidence for this relationship between response inhibition ability andimpulse control is weak and inconsistent. This study investigates the relationship between responseinhibition and both self-report and behavioural measures of impulsivity as well as engagement in riskybehaviours in a large community sample (N=174) of healthy adolescents and young adults (15-35yrs). Usinga stop-signal paradigm with a number parity go task, we implemented a novel hierarchical Bayesian modelof response inhibition that estimates stop-signal reaction time (SSRT) as a distribution and also accounts forfailures to react to the stop-signal (i.e., “trigger failure”), and failure to react to the choice stimulus (i.e., “gofailure” or omission errors). In line with previous studies, the model reduced estimates of SSRT by up to100ms compared with traditional non-parametric estimation techniques. Although some relationshipsbetween behavioural and self-report measures of impulsivity with traditionally estimated SSRT weresupported, they did not hold for the model-based SSRT estimates. Instead, the behavioural impulsivitymeasures were found to be related to trigger failure. We suggest that trigger failure is correlated with impulsivity because it indexes higher order processing related to inhibition, whereas SSRT, when estimatedwithout confounding from trigger failure, indexes more automatic inhibitory processes.

Item Type: Article
Authors/Creators:Skippen, P and Matzke, D and Heathcote, A and Fulham, WR and Michie, P and Karayanidis, F
Keywords: Response inhibition, Stop-signal task, Trigger Failure, Impulsivity, Bayesian modelling, Plausible values
Journal or Publication Title: Acta Psychologica: International Journal of Psychonomics
Publisher: Elsevier Science Bv
ISSN: 0001-6918
DOI / ID Number: 10.1016/j.actpsy.2018.10.016
Copyright Information:

© 2018 Elsevier B.V. All rights reserved.

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