The Impact of Reward-induced Dopamine Release on Functional Connectivity: a Combined PET/fMRI Study
Descripción general del estudio
Estado
Condiciones
Descripción detallada
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.
Tipo de estudio
Inscripción (Actual)
Contactos y Ubicaciones
Ubicaciones de estudio
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New York
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Stony Brook, New York, Estados Unidos, 11794
- Health Sciences Center
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Criterios de participación
Criterio de elegibilidad
Edades elegibles para estudiar
Acepta Voluntarios Saludables
Géneros elegibles para el estudio
Método de muestreo
Población de estudio
Descripción
Inclusion Criteria:
- Healthy men and women age 18-45 who have the capacity to consent to the protocol.
- Ability to understand and follow instructions and oriented to name, time, and place.
- A negative urine pregnancy and toxicology screen
- Willingness to abstain from using aspirin, NSAIDs, or anticoagulants during the study
Exclusion Criteria:
- Left-handed or ambidextrous
- History of seizures
- History of strokes
- Clinically significant, uncontrolled liver, kidney, cardiac, or pulmonary disease
- Terminal medical diagnosis consistent with survival < 1 year
- Serious mental impairment. Mini mental state exam of < 23/30
- Current or past DSM-IV Axis I or neurologic disorders
- 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)
- Unstable medical condition (≥ 3 months), or serious medical illnesses during the past three months (e.g., serious infections)
- Unexplained loss of consciousness; history of traumatic brain injury involving loss of consciousness greater than 2 minutes
- Currently pregnant or breastfeeding, sexually active and of child-bearing potential and not using adequate contraceptive methods
- Childbirth or miscarriage during past 6 months, breastfeeding within 6 months of recruitment
- Allergic to latex and/or study pharmaceuticals
- Diabetes and/or unable to fast for up to 7 hours
- Unable to lie comfortably in the scanner for up to 4 consecutive hours
- 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
- Contraindications for MRI including neurostimulators, implanted medical devices, metal in the body, claustrophobia, weight over 440 pounds, and girth size incompatible for scanner bore.
- Participation in a similar Social Feedback Task within 2 months of the start of the study.
Plan de estudios
¿Cómo está diseñado el estudio?
Detalles de diseño
¿Qué mide el estudio?
Medidas de resultado primarias
Medida de resultado |
Medida Descripción |
Periodo de tiempo |
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Dopamine receptor binding potential
Periodo de tiempo: 1-3 weeks
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changes in dopamine receptor binding potential will be measured during and after a reward task or social stimulus task
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1-3 weeks
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Resting state fMRI
Periodo de tiempo: 1-3 weeks
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Resting state functional connectivity will be measured using fMRI
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1-3 weeks
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Event-related potential (ERP) during reward
Periodo de tiempo: 1-3 weeks
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ERP during a reward task is measured
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1-3 weeks
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Colaboradores e Investigadores
Patrocinador
Fechas de registro del estudio
Fechas importantes del estudio
Inicio del estudio
Finalización primaria (Actual)
Finalización del estudio (Actual)
Fechas de registro del estudio
Enviado por primera vez
Primero enviado que cumplió con los criterios de control de calidad
Publicado por primera vez (Estimar)
Actualizaciones de registros de estudio
Última actualización publicada (Actual)
Última actualización enviada que cumplió con los criterios de control de calidad
Última verificación
Más información
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