Neural Mechanisms of Cost and Benefit Integration During Decision-Making, Aim 2: Acute & Lifetime Stress
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 397
- 试验地点
- 1
- 主要终点
- Amount in Dollars ($) Participants are Willing to Allocate to Avoid Use of Self-Control during Decision-Making Task
研究概览
简要总结
The central aim of this study is to characterize how the costs of acute and lifetime stress affect the neural architecture for decision-making in healthy humans. Investigators will use behavioral choice paradigms to measure how the costs of stress influence decisions about rewards (e.g., foods, money) as well as decisions about the use of self-control strategies. They will further examine associations between these stress measures and other decision variables commonly studied in our lab which have well-understood mechanisms, such as risk preferences. This behavioral work lays the foundation for an fMRI experiment that combines our measures of the behavioral costs of stress with neural measures of brain changes. Acute stress will be measured using a physiological stressor (cold-pressor task) coupled with saliva sample collection for cortisol analysis. Lifetime stress will be measured using a computerized life stress survey. We will study three cohorts: One purely behavioral cohort will be examined on-site (n=60). In a smaller subset of participants (n=40), investigators will measure neural activity changes in relevant brain areas as measured with MRI during decisions to use self-control in the presence of rewards. In a larger sample (n=500) the correlation between participants' risk preferences and lifetime stress exposure at scale using Amazon Mechanical Turk subjects will be measured.
研究设计
- 研究类型
- Observational
- 观察模型
- Cohort
- 时间视角
- Prospective
入排标准
- 年龄范围
- 18 Years 至 64 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •English as a native language
- •Corrected-to-normal vision
- •Individuals on diets to maintain or lose weight, or those not on a diet
- •All races, ethnicities, and cultures
排除标准
- •For all fMRI studies we will exclude participants who meet one of the standard CBI MRI exclusion criteria (see attached exclusion questionnaire) prior to participation. This screening questionnaire will be administered prior to scheduling the study, and once again before the scanner session during the second consenting procedure.
- •History of and/or medication for neurological or psychiatric disorders
- •High blood pressure, heart condition or related medical conditions
- •Diabetes, metabolic disorders, history of eating disorders, or food allergies
- •Pregnancy
- •Handedness (this has been shown be indicative of variations in brain circuitry)
- •Since we will measure stress hormones, subjects currently taking corticosteroids or beta-blockers will be ineligible to participate, as these medications have been found to dramatically alter stress hormone levels.
- •Furthermore, evidence suggests that fluctuations in bodily hormones (such as that induced through hormonal contraceptives or different stages of menstrual cycle phase) can affect stress hormone levels (Tersman, Collins, & Eneroth, 1991; Kirschbaum et al, 1999; Andreano, Arjomanid, Cahill, 2008). In order to account for hormonal differences, we will ask female participants if they are taking oral contraceptives. Likewise, we propose to use a simple, non-invasive questionnaire to determine cycle phase, as in McCormick & Teillon,
- •We may need to exclude on the basis of whether or not female participants use hormone-based contraceptives, which, for the reason stated above, could be a potential confound.
- •In some cases, we will pre-screen subjects to ensure they are on a diet to maintain or lose weight in order to examine how dietary and health goals influence decisions about self-control and rewards.
结局指标
主要结局
Amount in Dollars ($) Participants are Willing to Allocate to Avoid Use of Self-Control during Decision-Making Task
时间窗: Up to 2 Hours
Amount participants would be willing to spend to avoid use of self-control will be evaluated during a decision-making task in Cohorts 1 and 2.
Stress and Adversity Inventory (STRAIN) Overall Severity Score
时间窗: 60 Minutes
Cumulative lifetime stress will be quantified as a score (Overall Severity Score; OSS) derived from the Stress and Adversity Inventory (STRAIN) questionnaire.
次要结局
未报告次要终点