Impulsivity, Brain Function, and Substance Abuse Treatment in Cocaine Dependent Individuals

Study Overview
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Brief Summary
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Cocaine dependence is a major public health problem; an effective primary treatment for cocaine dependent individuals has yet to be found. The purpose of this trial is to evaluate aspects of treatment response in cocaine dependent individuals.

Detailed Description
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Cocaine is a strong central nervous system stimulant that is widely abused throughout the United States. Due to its widespread use, it is important to develop an effective treatment for cocaine dependence. The purpose of this study is to determine how impulsivity and prefrontal cortical function are related to treatment response in cocaine dependent individuals. Participants in this study will complete four separate experiments, each with a different aim and testing panel [cognitive function tests with and without functional magnetic resonance imaging (fMRI)]. The first experiment will examine memory, attention, cognitive function, and impulsivity; the aim is to determine the relationship between impulsivity and cognitive function in cocaine dependent individuals receiving treatment. The second experiment will examine the relationship between impulsivity and the prefrontal cortical structure and function. Participants will complete an fMRI during the second experiment. The third experiment will consist of cognitive function tests and will examine the prefrontal cortex in relation to treatment response, based on four different treatments: 1) L-dopamine, 2) naltrexone, 3) modafinil, and 4) placebo. The fourth experiment will examine the effect of cocaine dependence treatment on prefrontal cortex, focusing on participants receiving modafinil.

Official Title
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Impulsivity, Brain Function and Substance Abuse Treatment

Conditions
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Cocaine Abuse, Cocaine-Related Disorders

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Meets DSM-IV criteria for cocaine dependence Met inclusion criteria for other cocaine dependence studies within the center grant Exclusion Criteria: Current or history of DSM-IV Axis I disorders, other than substance abuse or dependence Lifetime diagnosis of alcohol dependence Serious non-psychiatric medical illness requiring ongoing medical treatment or one that affects the central nervous system Positive urine drug screen test for drugs of abuse other than cocaine at the time of study entry AIDS-defining illness Intelligence Quotient (IQ) below 70 Pregnant Uses a pacemaker, metal or electromechanical implants, or metallic foreign bodies

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 55 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| fMRI brain activation | Baseline predictor of treatment response | baseline | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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cocaine abuse, Cocaine-Related Disorders