Locating Regions of Interest in Generalized Anxiety Disorder Using Function Magnetic Resonance Imaging (fMRI)

Study Overview
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Brief Summary
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The investigators are seeking to locate the brain regions of interest in generalized anxiety disorder (GAD) using both structural (sMRI) and functional magnetic resonance imaging (fMRI). The MRI will be used to measure changes in blood flow in the brain while at rest and while completing tasks designed to elicit symptoms of anxiety. Results from a nonclinical control group and a GAD group will be compared to determine whether they exhibit different areas of brain activity during the tasks.

Detailed Description
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20 healthy controls and 20 participants with GAD will be recruited. Each participant will undergo an MRI session that will last approximately 2 hours. The structural MRI will be used when the participant is at rest. During the functional MRI (fMRI), a computer screen inside the scanner will display four tasks the participant must complete: (1)Gambling Task, (2)Risk & Ambiguity Task, (3)Reading Emotion from the Eyes (REE) Task, and (4)Emotional Counting Task.

Official Title
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Locating Regions of Interest in Generalized Anxiety Disorder Using Function Magnetic Resonance Imaging (fMRI)

Conditions
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Generalized Anxiety Disorder

Participation Criteria
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Eligibility Criteria
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Generalized Anxiety Disorder(GAD)Group: Inclusion Criteria: Clinical diagnosis of Generalized Anxiety Disorder Hamilton Anxiety Rating Scale score of 18 or higher Hamilton Rating Scale for Depression score of 17 or less Fluency in English Capacity to understand the nature of the study and willingness to sign informed consent for Exclusion Criteria: History of epilepsy or head trauma (Loss of consciousness>5 minutes) with the past 6 months Lifetime history of increased intracranial pressure, seizure disorder, stroke, brain tumor, multiple sclerosis or brain surgery A review of patient medications by the study physician indicates an increased risk of seizure An active autoimmune, endocrine, viral, or vascular disorder affecting the brain; any unstable cardiac disease; hypertension; or severe renal or liver insufficiency Substance use disorder or posttraumatic stress disorder (PTSD) within the past 6 months Lifetime bipolar disorder, obsessive-compulsive disorder (OCD), psychotic disorder, mental retardation, or pervasive development disorder Any psychotic features, including dementia or delirium Medication change within past 3 months Current serious suicidal or homicidal ideation, and/or serious suicidal attempt within past 6 months Serious, unstable, or terminal medical condition or clinically judged too psychiatrically unstable to participate in the study Any contraindication for participation in MRI scan Nonclinical Control Group: Inclusion Criteria: Absence of any psychiatric diagnosis Exclusion Criteria: History of epilepsy or head trauma (Loss of Consciousness>5 minutes) with the past 6 months Lifetime history of increased intracranial pressure, seizure disorder, stroke, brain tumor, multiple sclerosis or brain surgery A review of patient medications by the study physician indicates an increased risk of seizure An active autoimmune, endocrine, viral, or vascular disorder affecting the brain; any unstable cardiac disease; hypertension; or severe renal or liver insufficiency Substance use disorder or PTSD within the past 6 months Lifetime bipolar disorder, OCD, psychotic disorder, mental retardation, or pervasive development disorder Any psychotic features, including dementia or delirium Medication change within past 3 months Current serious suicidal or homicidal ideation, and/or serious suicidal attempt within past 6 months Serious, unstable, or terminal medical condition or clinically judged too psychiatrically unstable to participate in the study Any contraindication for participation in MRI scan

Ages Eligible for Study
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Minimum Age: 18 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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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Generalized Anxiety Disorder<br>The group of participants diagnosed with generalized anxiety disorder. | |
| Nonclinical Control Group<br>The comparison group of participants with no psychiatric diagnoses. | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Brain activation while undergoing the fMRI | Main effects for each condition will be calculated to elucidate brain activations relevant to the tasks. Random effect 2 sample t-tests will assess group differences (i.e., GAD patients vs. healthy controls) to identify regions that demonstrate hyperactivation in patients. | Throughout the fMRI | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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fMRI, Generalized Anxiety Disorder