Dissociating Components of Anhedonia: A Pilot fMRI Study

Not Applicable

Completed

• Conditions: Anhedonia
• Interventions: Other: Functional Magnetic Resonance Imaging; Other: Effort-Expenditure for Rewards Task

• Registration Number: NCT02569034
• Lead Sponsor: University of Florida

Brief Summary

Anhedonia, decreased motivation for and sensitivity to rewarding experiences, is present in at least 1/3 of community dwelling older adults and is a feature of various psychiatric and neurological disorders, including late-life depression and Parkinson's disease. Anhedonia is associated with cognitive deficits, as well as poor clinical outcomes and increased mortality. Recent research suggests that anhedonia comprises motivational (reward "wanting") and consummatory (reward "liking") aspects. However, previous research on anhedonia has failed to dissociate these components, which may explain the contradictory findings in the literature. Recently, the Effort-Expenditure for Rewards Task (EEfRT) was developed in an effort to dissociate reward components in anhedonia. The EEfRT is an effort-based decision-making task that measures reward "wanting", in contrast to commonly used anhedonia questionnaires, which focus on reward "liking." This novel task may provide a useful measure of components of anhedonia in older adults and in different patient populations. Thus far no data is available on this task in elderly individuals, and the cognitive and neural correlates of components of the task have not been investigated. Given the paucity of research on the neurobiology of anhedonia, cognitive neuroscience studies using this task could fill a gap in the literature. The investigators are developing a line of cognitive neuroscience studies examining anhedonia in community-dwelling older adults and in late-life depression and Parkinson's disease. This study will involve gathering pilot behavioral and functional magnetic resonance imaging (fMRI) data in young and older adults performing the EEfRT task. Understanding the brain mechanisms underlying anhedonia in older adults and in different patient populations will have a translational impact by elucidating biological targets for treatment.

Detailed Description

Twenty young adults (aged 18-38) and 20 older adults (aged 60-80) will perform the EEfRT while fMRI data are acquired. To quantify brain activity associated with reward "wanting," the fMRI activation will be measured while participants view information about reward probability and choose to perform the easy or hard task, with greater reward associated with the hard task. The investigators will measure activation during presentation of reward magnitude to capture brain activity associated with reward "liking." Participants will also complete a brief cognitive battery and anhedonia questionnaires.

Study Timeline

• Study First Submitted: 2015-10-02
• Study First Submitted QC: 2015-10-02
• Study First Posted: 2015-10-06
• Study Start: 2016-02
• Primary Completion: 2018-05-08
• Study Completion: 2018-05-08
• Status Verified: 2018-11
• Last Update Submitted: 2018-11-09
• Last Update Posted: 2018-11-13

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 46

Inclusion Criteria

• Age 18-38 or 60-80 years
• Able to provide verbal and written consent
• Right-handed
• Native English speaker
• At least 12 years of formal education

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Exclusion Criteria

• Significant cognitive disturbance
• Self-report of current or past history of psychiatric disturbance other than major depression (e.g., bipolar disorder, schizophrenia, alcohol and/or substance abuse)
• Self-report of neurological disturbance (stroke, dementia, traumatic brain injury), chronic medical illness (HIV, metastatic cancer), or unstable medical conditions (cardiac or pulmonary disease)
• Physical impairments, language comprehension deficits, or significant hearing disturbances that would limit ability to perform tasks
• Current anticholinergic, psychotropic (stimulants or dopamine agonists), or anti-epileptic use
• Visual acuity difficulties that would interfere with task performance
• Motor deficits that may interfere with the use of the dominant hand for performance of button press associated with the EEfRT task
• MRI contraindications (e.g., ferrous metal in the body, claustrophobia, pregnancy)

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Young Adults	Functional Magnetic Resonance Imaging	These participants will perform the Effort-Expenditure for Rewards Task (EEfRT) while an functional magnetic resonance imaging (fMRI) is performed. They will also complete a battery of both cognitive and anhedonia questionnaires.
Young Adults	Effort-Expenditure for Rewards Task	These participants will perform the Effort-Expenditure for Rewards Task (EEfRT) while an functional magnetic resonance imaging (fMRI) is performed. They will also complete a battery of both cognitive and anhedonia questionnaires.
Older Adults	Functional Magnetic Resonance Imaging	These participants will perform the Effort-Expenditure for Rewards Task (EEfRT) while an functional magnetic resonance imaging (fMRI) is performed. They will also complete a battery of both cognitive and anhedonia questionnaires.
Older Adults	Effort-Expenditure for Rewards Task	These participants will perform the Effort-Expenditure for Rewards Task (EEfRT) while an functional magnetic resonance imaging (fMRI) is performed. They will also complete a battery of both cognitive and anhedonia questionnaires.

Primary Outcome Measures

Name	Time	Method
fMRI Activity	Approximately Day 14 (Visit 2)	To quantify brain activity associated with reward "wanting," the investigators will contrast fMRI activation while participants view information about reward probability and choose to perform the easy or hard task with activity during fixation. The investigators will contrast activation during performance feedback and presentation of reward magnitude with activation during fixation to capture brain activity associated with reward "liking." Parameter estimates (ß) will be generated, which indicated relative strength of covariance between the data and the hemodynamic response function (HRF). The investigators will use a three-dimensional spatial contiguity threshold of 20 voxels and a statistical significance threshold of p ≤ .005 to decrease the likelihood of spurious findings.
EEfRT Task Test	Approximately Day 14 (Visit 2)	The EEfRT is a computerized task in which participants are presented with a series of repeated trials during which they choose between performing a ''hard-task'' or an ''easy-task'' in order to earn varying amounts of monetary rewards.

Secondary Outcome Measures

Name	Time	Method
Montreal Cognitive Assessment (MoCA)	Baseline (Visit 1)	Cognitive screening instrument. The highest possible score is 30. 18 - 26 = mild cognitive impairment, 10 - 17 = moderate cognitive impairment and less than 10 = severe cognitive impairment.
Letter-Number Sequencing (Wechsler Adult Intelligence Scale, 4th Edition)	Baseline (Visit 1)	Subjects hear a string a numbers and letters and must repeat them with the numbers first, in order, followed by the letters in alphabetical order.
Brief Visuospatial Memory Test-Revised (BVMT-R)	Baseline (Visit 1)	Subjects are asked to learn and remember the identity and location of 6 simple figures displayed on a page.
Snaith-Hamilton Pleasure Scale (SHAPS)	Baseline (Visit 1)	The SHAPS measures hedonic capacity. A higher total SHAPS score will indicate a higher level of anhedonia or the inability to experience pleasure.
Beck Depression Inventory, 2nd Edition (BDI-II)	Baseline (Visit 1)	21-item self-report questionnaire assessing symptoms of depression.
Wisconsin Card Sorting Test	Baseline (Visit 1)	A number of stimulus cards are to be match within 20 minutes. Participants must figure out the sorting rule based on feedback from the examiner.
Controlled Oral Word Association/Category Fluency	Baseline (Visit 1)	Subjects are asked to name as many words as they can in 60 seconds based on either a letter (F, A, and S) or a category (animals) rule.
California Verbal Learning Test II (CVLT-II)	Baseline (Visit 1)	Subjects are asked to learn and remember a 16-item word list.
Temporal Experience of Pleasure scale (TEPS)	Baseline (Visit 1)	18-item self-report questionnaire assessing anticipatory pleasure and consummatory pleasure
Positive Affect Negative Affect Scale (PANAS)	Baseline (Visit 1)	Subjects are required to respond to a 20-item test using 5-point scale that ranges from very slightly or not at all (1) to extremely (5).
Card Stroop Task	Baseline (Visit 1)	Participants must 1) read color words (red, green and blue) aloud, 2) name the ink color of a string of X's presented in rows on a page, and 3) name the ink color of color words (red, green, blue) written in either the same or a different color as the word meaning.
Digit Span (Wechsler Adult Intelligence Scale, 4th Edition)	Baseline (Visit 1)	Subjects repeat a string of numbers in either the same order (digits forward) or in reverse order (digits backward).
Center for Epidemiologic Studies Depression Scale (CES-D)	Baseline (Visit 1)	This is a 20-item measure of depression severity.
Apathy Scale (AS)	Baseline (Visit 1)	14-item self-report questionnaire assessing symptoms of apathy over the previous 2-4 weeks
Geriatric Depression Scale (GDS)	Baseline (Visit 1)	Subjects answer 30 yes/no questions assessing symptoms of depression.
State-Trait Anxiety Inventory (STAI)	Baseline (Visit 1)	The STAI measures two extremes of anxiety affect, labeled state anxiety (A-State), and trait anxiety (A-Trait). Higher scores suggest higher levels of anxiety.
Lille Apathy Rating Scale (LARS)	Baseline (Visit 1)	33 queries belonging to nine domains, each corresponding to a clinical manifestation of apathy
Dementia Rating Scale-2 (DRS-2)	Baseline (Visit 1)	The scale includes 36 tasks which are grouped into five subscales assessing different cognitive domains, namely: Attention, Initiation/Perseveration (I/P), Construction, Conceptualization and Memory.
Trail Making Test Parts A and B	Baseline (Visit 1)	The task requires a subject to 'connect-the-dots' of 25 consecutive targets on a sheet of paper or computer screen. There are two parts to the test: A, in which the targets are all numbers (1,2,3..) and the test taker needs to connect them in sequential order, and B, in which the subject alternates between numbers and letters (1, A, 2, B, etc.). The test should be finished as quickly as possible within 5 minutes. The poorer the performance the higher the impairment.

Trial Locations

Locations (1)

University of Florida; 🇺🇸 Gainesville, Florida, United States