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The Impact of Reward-induced Dopamine Release on Functional Connectivity: a Combined PET/fMRI Study

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT02801643
Recruitment Status : Completed
First Posted : June 16, 2016
Last Update Posted : April 18, 2018
Information provided by (Responsible Party):
David Hsu, Stony Brook University

Brief Summary:
The present study would be the first to investigate the relationship between reward- and or social stimuli-induced dopamine (DA) release and neural function using a combined PET/fMRI approach. Data from this project conducted in healthy subjects will provide preliminary data for a larger grant application to study patient populations with known abnormalities in DA including schizophrenia, major depressive, substance use, and eating disorders.

Condition or disease

Detailed Description:

Aim 1. To test the relationship between reward-induced dopamine (DA) release on changes in resting state functional connectivity (RSFC) in healthy subjects. In 20 healthy adults, the investigators will examine DA release (measured using positron emission tomography, PET) in the ventral striatum, thalamus, and prefrontal cortex, as previously described. Before and after the task the investigators will examine RSFC (measured using functional magnetic resonance imaging, fMRI) between these structures, which have been shown to form functional pathways serving motivation and emotion regulation in rodents and nonhuman primates. The investigators hypothesize that DA release will impact the functional relationship between these and other structures as determined by changes in RSFC.

Aim 2. To examine the relationship between dopamine release and the Reward Positivity (RewP) potential. Subjects will be presented with the option to participate in an event-related potential (ERP) study. The investigators will correlate the amount of DA release with the amplitude of the RewP potential, an ERP that is enhanced in reward versus non-reward circumstances. Based on previous studies, the investigators hypothesize that RewP amplitude will positively correlate with dopamine release in the nucleus accumbens.

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Study Type : Observational
Actual Enrollment : 5 participants
Observational Model: Cohort
Time Perspective: Cross-Sectional
Official Title: The Impact of Reward-induced Dopamine Release on Functional Connectivity: a Combined PET/fMRI Study
Study Start Date : June 2016
Actual Primary Completion Date : December 2017
Actual Study Completion Date : December 2017

Resource links provided by the National Library of Medicine

Drug Information available for: Dopamine

Primary Outcome Measures :
  1. Dopamine receptor binding potential [ Time Frame: 1-3 weeks ]
    changes in dopamine receptor binding potential will be measured during and after a reward task or social stimulus task

  2. Resting state fMRI [ Time Frame: 1-3 weeks ]
    Resting state functional connectivity will be measured using fMRI

  3. Event-related potential (ERP) during reward [ Time Frame: 1-3 weeks ]
    ERP during a reward task is measured

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   18 Years to 45 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population
20 subjects (ages 18-45 years) will be included. Male and female representation will be about equal. No ethnic/racial/gender group is excluded.

Inclusion Criteria:

  1. Healthy men and women age 18-45 who have the capacity to consent to the protocol.
  2. Ability to understand and follow instructions and oriented to name, time, and place.
  3. A negative urine pregnancy and toxicology screen
  4. Willingness to abstain from using aspirin, NSAIDs, or anticoagulants during the study

Exclusion Criteria:

  1. Left-handed or ambidextrous
  2. History of seizures
  3. History of strokes
  4. Clinically significant, uncontrolled liver, kidney, cardiac, or pulmonary disease
  5. Terminal medical diagnosis consistent with survival < 1 year
  6. Serious mental impairment. Mini mental state exam of < 23/30
  7. Current or past DSM-IV Axis I or neurologic disorders
  8. Actively abusing substances, including alcohol (regular alcohol use during the past 6 months equal to or greater than 16 cans of beer per week or equivalent; use of street drugs or regular tobacco use during the past 6 months)
  9. Unstable medical condition (≥ 3 months), or serious medical illnesses during the past three months (e.g., serious infections)
  10. Unexplained loss of consciousness; history of traumatic brain injury involving loss of consciousness greater than 2 minutes
  11. Currently pregnant or breastfeeding, sexually active and of child-bearing potential and not using adequate contraceptive methods
  12. Childbirth or miscarriage during past 6 months, breastfeeding within 6 months of recruitment
  13. Allergic to latex and/or study pharmaceuticals
  14. Diabetes and/or unable to fast for up to 7 hours
  15. Unable to lie comfortably in the scanner for up to 4 consecutive hours
  16. Would receive a total of over 5 rems to a radiosensitive organ (bone marrow, gonads, lens of the eye) or 15 rems to any other organ or to the body as a whole during a 12 month period
  17. Contraindications for MRI including neurostimulators, implanted medical devices, metal in the body, claustrophobia, weight over 440 pounds, and girth size incompatible for scanner bore.
  18. Participation in a similar Social Feedback Task within 2 months of the start of the study.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT02801643

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United States, New York
Health Sciences Center
Stony Brook, New York, United States, 11794
Sponsors and Collaborators
Stony Brook University
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Responsible Party: David Hsu, Assistant Professor of Psychiatry, Stony Brook University Identifier: NCT02801643    
Other Study ID Numbers: PET/MR Pilot
First Posted: June 16, 2016    Key Record Dates
Last Update Posted: April 18, 2018
Last Verified: April 2018
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No
Keywords provided by David Hsu, Stony Brook University: