The impact of yohimbine-induced arousal on facets of behavioural impulsivity

Herman, Aleksandra M, Critchley, Hugo D and Duka, Theodora (2019) The impact of yohimbine-induced arousal on facets of behavioural impulsivity. Psychopharmacology. ISSN 0033-3158

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Abstract

Rationale
State-dependent changes in physiological arousal may influence impulsive behaviours.

Objectives
To examine the relationship between arousal and impulsivity, we assessed the effects of yohimbine (an α2-adrenergic receptor antagonist, which increases physiological arousal via noradrenaline release) on performance on established laboratory-based impulsivity measures in healthy volunteers.

Methods
Forty-three participants received a single dose of either yohimbine hydrochloride or placebo before completing a battery of impulsivity measures. Blood pressure and heart rate were monitored throughout the study.

Results
Participants in the yohimbine group showed higher blood pressure and better response inhibition in the Stop Signal Task, relative to the placebo group. Additionally, individual changes in blood pressure were associated with performance on Delay Discounting and Information Sampling tasks: raised blood pressure following drug ingestion was associated with more far-sighted decisions in the Delay Discounting Task (lower temporal impulsivity) yet reduced information gathering in the Information Sampling Task (increased reflection impulsivity).

Conclusions
These results support the notion that impulsive behaviour is dependent upon state physiological arousal; however, distinct facets of impulsivity are differentially affected by physiological changes.

Item Type: Article
Keywords: Yohimbine, Noradrenaline, Heart Rate, Blood Pressure, Barratt Impulsiveness Scale, UPPS-P, Stop Signal Task
Schools and Departments: Brighton and Sussex Medical School > Brighton and Sussex Medical School
Brighton and Sussex Medical School > Neuroscience
School of Psychology > Psychology
Research Centres and Groups: Sackler Centre for Consciousness Science
Sussex Neuroscience
Depositing User: Aleksandra Maria Herman
Date Deposited: 16 Jan 2019 12:06
Last Modified: 02 Jul 2019 13:19
URI: http://sro.sussex.ac.uk/id/eprint/81309

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