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Cognitive impulsivity in cocaine and heroin polysubstance abusers
Antonio J Verdejo-García1, José C Perales, Miguel Pérez-García
1Dept. Personalidad, Evaluación y Tratamiento Psicológico, Universidad de Granada, Campus de Cartuja, s/n, 18071 Granada, Spain. averdejo@ugr.es
Addictive Behaviors
|August 1, 2006
Summary
Cocaine abusers show impaired response inhibition, while both cocaine and heroin abusers struggle with decision-making. These executive control function deficits highlight substance-specific impacts.
Area of Science:
- Neuroscience
- Psychology
- Addiction Research
Background:
- Chronic psychoactive substance abuse leads to significant executive control function (ECF) deficits.
- These deficits particularly impact cognitive impulsivity, including response inhibition and decision-making.
- The specific substance of abuse may influence the nature and extent of these ECF impairments.
Purpose of the Study:
- To compare response inhibition and decision-making in abstinent polysubstance abusers (PSA) of cocaine and heroin versus healthy controls.
- To investigate the differential impact of cocaine and heroin abuse on executive functions.
- To analyze task-switching effects on error patterns in PSA groups.
Main Methods:
- Utilized univariate and multivariate analyses of variance (ANOVA).
- Assessed response inhibition using Stroop, 5-Digit Test, and Go/No Go Task.
- Evaluated decision-making using the Iowa Gambling Task.
Main Results:
- Cocaine PSA, but not heroin PSA, exhibited significant response inhibition deficits compared to controls.
- Task contingency reversals affected commission errors in cocaine PSA and omission errors in heroin PSA.
- Both cocaine and heroin PSA demonstrated poorer decision-making performance than controls.
Conclusions:
- Cocaine abuse appears more strongly linked to motor impulsivity deficits.
- Both cocaine and heroin abuse are equally associated with impaired decision-making in complex tasks.
- Findings suggest distinct neurological and psychological effects of cocaine and heroin on executive functions.