Mechanisms of Repeated Real-time Biofeedback With 7-Tesla MRI in Depression
Previous work demonstrated that individuals are able to self-regulate their ventral tegmental area (VTA) activity using real-time biofeedback. The current study expands this approach to a larger sample with repeated training sessions to more robustly characterize the effects of VTA modulation. This mechanistic study will assess change in mood and motivation-related measures, as well as neural activity and connectivity changes.
研究概览
详细说明
Major depressive disorder (MDD) is one of the world's largest health problems with current treatments that are ineffective for a substantial proportion of individuals. There is a critical need for mechanistically informed interventions that are individualized and that aim to target core symptoms. Converging evidence from animal and human research in the field has implicated the ventral tegmental area (VTA), a key component of the brain's dopamine system, in regulating motivation and reward-related behaviour. Previous work has demonstrated that participants can successfully train to self-regulate their VTA activity using cognitive strategies while receiving real-time feedback. This shows that VTA self-regulation is feasible in humans. The current study builds on this previous work to further investigate the relationships between VTA activity modulation and mood and motivation related changes in individuals with MDD, in a mechanistic manner. Specifically, this study will aim to extend on prior findings by increasing the sample size and incorporating repeated training sessions. A total of 60 participants with MDD will be recruited and will be randomized in a 1:1 ratio to receive either active biofeedback or sham (control) feedback. Participants will complete two training sessions with real-time 7T-MRI biofeedback. During functional MRI (fMRI) scanning, participants will be trained to use self-generated cognitive strategies to modulate their VTA activity while viewing a visual representation of their brain signal (active condition) or a yoked control signal (sham condition). The primary objective of this study is to determine how variation in VTA modulation is associated with mood and motivation related mechanisms that might change over time. Secondary objectives include assessing changes in VTA activation and functional connectivity over time, as well as examining how neural changes relate to mood and motivation-related changes.
研究类型
注册 (估计的)
阶段
- 不适用
联系人和位置
学习联系方式
- 姓名：Laurel S Morris, Dr
- 电话号码：01865 (6)16577
- 邮箱：laurel.morris@ndcn.ox.ac.uk
学习地点
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Oxford、英国、OX39DU
- 招聘中
- Oxford Centre for Integrative Neuroimaging (OxCIN) FMRIB, Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital
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参与标准
资格标准
适合学习的年龄
接受健康志愿者
有资格学习的性别
描述
Inclusion Criteria:
- Male or female aged 18-65 years;
- Meets DSM-5 criteria for major depressive disorder (MDD) as determined by the Structured Clinical Interview for DSM-5 Axis Disorders (SCID) or the Mini International Neuropsychiatric Interview (MINI); with a current major depressive episode; as conducted in a research-based non-clinical setting.
- Participants must have a level of understanding of the English language sufficient to agree to all tests and examinations required by the study and must be able to participate fully in the informed consent process.
Exclusion Criteria:
- Current or history of schizophrenia or other psychotic disorder, neurodevelopmental disorder, neurocognitive disorder or cognitive impairment
- Active substance use disorder within the past 1 year;
- Any unstable medical illnesses;
- Women who are pregnant;
- Any contraindications to MRI
- Antidepressant medication initiated within 2 weeks of the Baseline Assessment and concomitant use of any other medication with central nervous system activity during active participation;
- Active suicidal intent or plan.
学习计划
研究是如何设计的？
设计细节
- 主要用途：基础科学
- 分配：随机化
- 介入模型：并行分配
- 屏蔽：双倍的
武器和干预
参与者组/臂 |
干预/治疗 |
|---|---|
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实验性的：Active Biofeedback
The participants in the active group will receive repeated active biofeedback training sessions. |
The active biofeedback session will be done within the 7T MRI. It will include MOTIVATE and active rest trials. During each MOTIVATE trial, subjects will be instructed to generate a heightened state of motivation. Subjects will simultaneously view a progress bar on the screen during MOTIVATE trials that represents their VTA activity and they will be trained to try to increase the level of the bar by motivating themselves. |
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假比较器：Sham Biofeedback
The participants in the sham group will receive repeated sham biofeedback training sessions. |
The sham biofeedback session resembles the active condition, however, the progress bar seen during the MOTIVATE trials will represent yoked sham values. |
研究衡量的是什么？
主要结果指标
结果测量 |
措施说明 |
大体时间 |
|---|---|---|
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Mood and Motivation Related Mechanistic Measures
大体时间：Pre to post biofeedback training, within a 6-week timeframe.
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A single composite metric will be derived by factor analysis of a battery of validated mood and motivation related instruments (e.g. PANAS-SF, POMS-SF, MAP-SR), providing one expected latent mood and motivation factor. Modelling the instruments jointly avoids nominating any single scale as the mechanistic outcome, and controls for multiple comparisons. Unit of measure: standardized latent factor score (z / SD units). |
Pre to post biofeedback training, within a 6-week timeframe.
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VTA Connectivity
大体时间：Pre to post biofeedback training, within a 4-week timeframe.
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Functional connectivity between the VTA seed and whole-brain (voxelwise), measured with 7-Tesla fMRI. Unit of measure: Fisher z-transformed correlation coefficient. |
Pre to post biofeedback training, within a 4-week timeframe.
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次要结果测量
结果测量 |
措施说明 |
大体时间 |
|---|---|---|
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VTA Activation
大体时间：Pre to post biofeedback training, within a 4-week timeframe.
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Blood-oxygen-level-dependent (BOLD) signal in the bilateral ventral tegmental area (VTA) region of interest for MOTIVATE versus active rest trials, measured with task-based 7-Tesla fMRI. Unit of measure: percent BOLD signal change. |
Pre to post biofeedback training, within a 4-week timeframe.
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Association between change in VTA measures and change in the mood and motivation factor
大体时间：Pre to post biofeedback training, within a 6-week timeframe.
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The standardized VTA activation and connectivity measure will each be tested for an association with change in the mood and motivation factor. One coefficient is reported per VTA measure. Unit of measure: standardized regression coefficient (dimensionless, from -1 to 1). |
Pre to post biofeedback training, within a 6-week timeframe.
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其他结果措施
结果测量 |
措施说明 |
大体时间 |
|---|---|---|
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Mood and Motivation EMA
大体时间：Pre to post biofeedback training, within a 6-week timeframe.
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Single-item mood and motivation ecological momentary assessment (EMA). Unit of measure: arbitrary likert rating. |
Pre to post biofeedback training, within a 6-week timeframe.
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合作者和调查者
研究记录日期
研究主要日期
学习开始 (估计的)
初级完成 (估计的)
研究完成 (估计的)
研究注册日期
首次提交
首先提交符合 QC 标准的
首次发布 (实际的)
研究记录更新
最后更新发布 (实际的)
上次提交的符合 QC 标准的更新
最后验证
更多信息
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