Nicotinic Modulation of the Default Network of Resting Brain Function
|First Received Date ICMJE||November 11, 2010|
|Last Updated Date||May 23, 2013|
|Start Date ICMJE||October 2010|
|Primary Completion Date||Not Provided|
|Current Primary Outcome Measures ICMJE
||Activity and functional connectivity of default regions during cognitive task performance, measures of cognitive task performance, measures of subjective state, and plasma concentrations of nicotine, nicotine metabolites and mecamylamine.|
|Original Primary Outcome Measures ICMJE||Not Provided|
|Change History||Complete list of historical versions of study NCT01240616 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||Nicotinic Modulation of the Default Network of Resting Brain Function|
|Official Title ICMJE||Nicotinic Modulation of the Default Network of Resting Brain Function|
- A brain circuit called the default network is the brain circuit that is active when the brain is at rest; that is, when individuals are not concentrating on specific tasks. Previous research has shown that the default network functions differently in people with schizophrenia and Alzheimer's disease, and may contribute to the problems with memory and concentration that can affect people who have these conditions. Studies have also shown that nicotine affects the default network, but more research is needed on the ways in which nicotinic receptors may change activity in these regions and thereby affect individuals' ability to concentrate on specific tasks.
- To determine whether and how nicotine and mecamylamine, a drug that blocks nicotinic receptors, affect the default network in nonsmokers in ways that improve thinking and concentration.
Objective: To evaluate the potential of manipulating activity in the so-called default network of resting brain function by nicotinic ligands. Default network activity modulates cognitive functioning, and effects of nicotine thereon may motivate smoking behavior. In the future, this mechanism could become a novel approach to improving cognition in disease populations that show dysfunction of this network, such as schizophrenia or Alzheimer's disease.
Study population: 27 healthy non-smokers.
Design: A double-blind, placebo-controlled, within-subject fMRI study, evaluating regional brain activation and cognitive functions under conditions of transdermal nicotine (7 mg/day), oral mecamylamine (a nicotinic antagonist, 7.5 mg), and placebo.
Outcome measures: Activity and functional connectivity of default regions during cognitive task performance, measures of cognitive task performance, measures of subjective state, and plasma concentrations of nicotine, nicotine metabolites and mecamylamine.
|Study Type ICMJE||Observational|
|Study Design ICMJE||Time Perspective: Prospective|
|Target Follow-Up Duration||Not Provided|
|Sampling Method||Not Provided|
|Study Population||Not Provided|
|Condition ICMJE||Nicotine Dependence|
|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||Recruiting|
|Estimated Enrollment ICMJE||42|
|Completion Date||Not Provided|
|Primary Completion Date||Not Provided|
|Eligibility Criteria ICMJE||
|Ages||21 Years to 55 Years|
|Accepts Healthy Volunteers||Yes|
|Location Countries ICMJE||United States|
|NCT Number ICMJE||NCT01240616|
|Other Study ID Numbers ICMJE||999911461, 11-DA-N461|
|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||July 2012|
ICMJE Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP