Effects of Nicotine on Cognitive Task Performance and Brain Activity as Measured by fMRI
|First Received Date ICMJE||December 18, 2009|
|Last Updated Date||November 27, 2013|
|Start Date ICMJE||September 2002|
|Primary Completion Date||Not Provided|
|Current Primary Outcome Measures ICMJE||Not Provided|
|Original Primary Outcome Measures ICMJE||Not Provided|
|Change History||Complete list of historical versions of study NCT01036711 on ClinicalTrials.gov Archive Site|
|Current Secondary Outcome Measures ICMJE||Not Provided|
|Original Secondary Outcome Measures ICMJE||Not Provided|
|Current Other Outcome Measures ICMJE||Not Provided|
|Original Other Outcome Measures ICMJE||Not Provided|
|Brief Title ICMJE||Effects of Nicotine on Cognitive Task Performance and Brain Activity as Measured by fMRI|
|Official Title ICMJE||Effects of Nicotine on Cognitive Task Performance and Brain Activity as Measured by fMRI|
- Many cigarette smokers claim that smoking improves their ability to think and concentrate, and have reported problems in thinking and concentration after quitting smoking. Some research has indicated that nicotine can enhance certain aspects of attention and memory in humans. However, more research is needed to determine how nicotine affects different elements of the brain s ability to think, pay attention, respond to rewards, and make decisions. Researchers are interested in using functional magnetic resonance imaging (fMRI) to study the effects of nicotine on brain function and activity.
- To determine the effects of nicotine on attentional and other thinking processes, including reward-seeking behavior.
- Individuals between 18 and 50 years of age who are either current smokers (10 or more cigarettes per day for at least 1 year) or nonsmokers.
Experiments in this protocol employ fMRI to address the interactions of nicotine with such cognitive processes as working memory, attention, and the executive functions of inhibitory control, conceptual reasoning and attention switching, in addition to reward and temporal error reward processing. The effects of nicotine on these cognitive processes will also be assessed outside the MRI scanner. Assessments of genetic variants will be done with the hypothesis that these will account for some inter-individual differences in the brain imaging data.
The study population will consist of adult (18-50 y.o.) non-treatment seeking smokers and age and gender matched non-smoking control subjects. The control subjects will provide normative data on cognitive task performance and corresponding neural activation, as well as providing control for any time effects (e.g. practice effect on repeated cognitive task performance). Smokers will smoke at least 10 cigarettes per day for a period of 1 year. Both smokers and controls will be suitable for fMRI scanning. Subjects may not be dependent on any other drug except nicotine or caffeine.
In a within subjects design, experienced smokers will perform cognitive tasks involving memory encoding and consolidation, selective/divided and sustained attention, as well as reward and temporal error reward processing two hours following single blind application of a nicotine patch (21 mg/24 hr) and during a separate session on a different day, following application of a placebo patch. The tasks will be performed during fMRI scanning. Not all of the tasks will be done at the same time, rather, groups of tasks are run in series as task sets: Task set A: Selective/divided attention task and Intention/ attention task; Task set B: The SARAT (Spatial Attentional Resource Allocation task) which is designed to enable dissociation of top-down and stimulus driven processes of visuospatial selective attention as well as the CEFER task which is a measure of central executive function task which isolates the allocation of attentional resources within working memory; Task set C: Monetary Incentive Delay and Temporal Delay Error processing tasks; Task set D: Affective Forecasting and Loss Aversion task. Control subjects will do the tasks during scanning without a patch. Blood will be drawn from all participants for analysis of genetic variants and for smokers, plasma nicotine and cotinine will be measured.
We will determine the acute effects of nicotine on attentional and other cognitive mechanisms and how emotional processes such as the anticipation and receipt of reward affects the neuronal activation properties of acute nicotine administration in experienced smokers. In addition, we will determine whether genetic polymorphisms predict BOLD response during cognitive tasks pertinent to nicotine addiction. Plasma nicotine and cotinine will be included as a factor in analyses of nicotine-induced effects on fMRI signal to take account of potentially large inter-individual variability in circulating nicotine concentrations.
|Study Type ICMJE||Observational|
|Study Design ICMJE||Not Provided|
|Target Follow-Up Duration||Not Provided|
|Sampling Method||Not Provided|
|Study Population||Not Provided|
|Intervention ICMJE||Not Provided|
|Study Group/Cohort (s)||Not Provided|
* Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
|Recruitment Status ICMJE||Completed|
|Estimated Enrollment ICMJE||400|
|Completion Date||November 2012|
|Primary Completion Date||Not Provided|
|Eligibility Criteria ICMJE||
|Ages||18 Years to 50 Years|
|Accepts Healthy Volunteers||Yes|
|Contacts ICMJE||Contact information is only displayed when the study is recruiting subjects|
|Location Countries ICMJE||United States|
|NCT Number ICMJE||NCT01036711|
|Other Study ID Numbers ICMJE||999902372, 02-DA-N372|
|Has Data Monitoring Committee||Not Provided|
|Responsible Party||Not Provided|
|Study Sponsor ICMJE||National Institute on Drug Abuse (NIDA)|
|Collaborators ICMJE||Not Provided|
|Information Provided By||National Institutes of Health Clinical Center (CC)|
|Verification Date||November 2012|
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