Generalized Anxiety Disorder and Social Anxiety Disorder: Their Impact on the Processing of Information and Learning

Completed

Conditions studied: Anxiety Disorders

In brief

The purpose of this study is to increase researchers understanding of the biological basis of generalized anxiety disorder and social anxiety disorder. They will investigate how the brain activity associated with specific thoughts and feelings may play a role in these anxiety disorders. This knowledge will be used to design interventions to help those with these illnesses. To qualify for this study, participants must be evaluated via an initial telephone screening interview and material sent through the mail. Participants will then be required to make three visits to NIH. During the first visit, they will be asked questions about their general mood, degree of nervousness, thinking skills, and behavior. They will undergo a thorough physical exam, including an EKG, blood work, urinalysis, and a pregnancy test for women of childbearing potential. During the second visit, participants will spend about 2.5 hours doing various tasks while sitting and looking at a computer screen. These tasks will guide them to experience specific kinds of thoughts and emotions. Researchers will attach electrodes to the participants hands to monitor the amount of electricity conducted by the skin. The third visit will be similar to the second visit, but participants will perform the tasks while lying in a MRI scanner. Participants will be compensated up to $400 for their involvement in this study.

Key facts

Study ID

NCT00062517

Run by

National Institute of Mental Health (NIMH)

People needed

497

Starts

2003-06-05

Expected to finish

2016-09-21

Last updated by the study team

2017-10-06

Who can join

Age: 18 and older, up to 50. Sex: any. Healthy volunteers: accepted.

You may not qualify if…

• Because factors such as psychiatric disease, or CNS disease, can influence functional brain activity, and pregnancy precludes participation in fMRI studies, these factors are exclusionary.
• Psychiatric history: Participants will be assessed using DSM-IV criteria via standardized psychiatric interviews conducted by trained examiners (i.e., SCID). Any current suicidal ideation will be exclusionary.
• Healthy comparison individuals (Group 1): All participants will be free of any current psychiatric disorder as well as lifetime history of psychosis, pervasive developmental disorder, major affective disorder, panic disorder, obsessive compulsive disorder, conduct disorder, ADHD, anorexia.
• Patients with GAD (Group 2): Any history of an axis I diagnosis excluding SAD but not including adjustment disorder, simple phobia or dysthymia is exclusionary. There must be no current mood disoder (MD) though patients with past MD, which occurred after the onset of GAD, will be admitted to the study. We recognize the difficulty of recruiting patients with GAD without co-morbid SAD and will therefore allow patients who are comorbid into the study in this group. We have faced difficulties with our studies of children with psychopathic tendencies where, although it is possible to identify populations who only meet criteria for ADHD most children who meet criteria for psychopathic tendencies are co-morbid for ADHD. We will adopt a similar strategy to our work with children; i.e., in contrasts of patients with GAD with comparison individuals, we will use SAD symptomatology as a covariate to reduce, and evaluate, the impact of pathology associated with SAD on the data.
• Patients with SAD (Group 3): Any current history of an axis I diagnosis including GAD, but excluding adjustment disorder, simple phobia or dysthymia is exclusionary. There must be no current mood disorder (MD) though patients with past MD, which occurred after the onset of SAD, will be admitted to the study.
• History of Drug Abuse: Axis I diagnoses of substance use disorders will be exclusionary.
• Severe acute and chronic medical illnesses.
• CNS disease: History of brain abnormalities (e.g., neoplasms, subarachnoid cysts), cerebrovascular disease, infectious disease (e.g., abscess), or other neurological disease, or history of head trauma (defined as loss of consciousness > 3 min).
• Metal or electronic objects: Metal plates, certain types of dental braces, cardiac pacemakers, etc., that are sensitive to electromagnetic fields contraindicate MRI scans.
• Claustrophobia: Participants will be questioned about potential discomfort in being in an enclosed space, such as an MRI scanner.
• Pregnancy status: Because of the potential effects of hormonal changes on brain function as well as the unknown effects of electromagnetic field on the fetus, known pregnancy is an exclusion criterion.

Where it is running

• National Institutes of Health Clinical Center, 9000 Rockville Pike — Bethesda, Maryland, United States

Full record on ClinicalTrials.gov

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