Altruistic Decisions
Study on the Parameters That Influence Perceptual Decisions
研究概览
地位
条件
研究类型
注册 (实际的)
阶段
- 不适用
联系人和位置
学习地点
-
-
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Bron、法国、69677
- CH Le Vinatier
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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:
- Aged between 18 and 35
- Right-handed
- French
- Normal vision or corrected by contact lenses
Exclusion Criteria:
- Contraindications to the MEG examination
- Presence of a perceptual disorder (vision) or motor impairing the capacity to carry out the tasks requested (including dyschromatopsia and achromatopsia).
- Taking of medical treatment in progress (excluding contraceptive pill).
- Known neurological or psychiatric history or disorders.
- Participants in an exclusion period for any other research.
- Participants who do not benefit from social protection.
- Participants refusing to be informed of the results of the medical examination.
- Participants who refuse to be informed of the possible detection of an anomaly.
- Participants with MRI contraindications
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:非随机化
- 介入模型:并行分配
- 屏蔽:无(打开标签)
武器和干预
参与者组/臂 |
干预/治疗 |
---|---|
其他:Vicarious reward
If a decision influences the well-being of another (through monetary payoff), the decision making processes should differ from a decision that would influences only oneself. The difference will be reflected in the reaction-times and in the accuracy of the response to the task. The drift diffusion models care then used to estimate le decision parameter in each condition and understand which parameter is influenced by the beneficiary of the payoff associated with a decision. Once the decision parameter characterized with behavioral experiment, the study aims to better understand the neural network sustaining the influence of others on the decision making process, by assessing the neural activity related to the decision making processes. Also, the research compares how the brain responses for payoff for others and payoffs for oneself, specially to confirm that these responses are located in different areas of the Anterior cingulate Cortex. |
Random-dots tasks: dots appear and move, most have a random trajectory but a given proportion of them move coherently to the same direction.
Both behavioral task (audience effect and vicarious reward) will be studied in fMRI (functional Magnetic Resonance Imagery). The same paradigms used in the behavioral experiment will be adapted for fMRI. Audience Effect experiment: trials will last for 10 seconds maximum. With 80 trials for each condition (public easy, public difficult, private easy and private difficult), the task will count a total of 320 trials and have a 54 minutes duration, in 3 runs of 17 minutes each. Vicarious Reward experiment: trials will have a 10 seconds maximum duration. Using 40 trials for each condition (other low payoff, other high payoff, self low payoff, self high payoff, control condition), the task will have a total of 200 trials and last for 54 minutes, in 6 runs of 9 minutes each. Both behavioral task (audience effect and vicarious reward) will be studied in MEG (MagnetoEncephaloGraphy). The same paradigms used in the behavioral experiment will be used in MEG. Audience Effect experiment: trials will last for 7 seconds maximum. With 100 trials for each condition (public easy, public difficult, private easy and private difficult), the task will count a total of 400 trials and have a 47 minutes duration. Every 100 trials (about 12 minutes of tasks), a break will be proposed to the participants. Vicarious Reward experiment: trials will have a 7.2 seconds maximum duration. Using 75 trials for each condition (other low payoff, other high payoff, self low payoff, self high payoff, control condition), the task will have a total of 375 trials and last for 45 minutes. Every 125 trials (every 15 minutes), a break will be proposed to the participants. |
其他:Audience effect
In order to clarify the complex changes in the decision-making processes induced by simple observation by others (audience) , the experiment have two levels of difficulty .
These levels of difficulty will be determined in such a way as to achieve better 'public' performance than 'private' when the task is easy (high level of consistency) and poor performance when the task is difficult (low level of coherence) As described in the literature in psychology.
Drift diffusion models will be used to better understand the variations in performance, to decipher between a modulation of the diffusion velocity and or of the decision threshold.
This study will help characterize how observation by others modulates performance.
Once the decision parameter characterized with behavioral experiment, the study aims to better understand the neural network sustaining the impact of observation by others on the decision making process.
|
Random-dots tasks: dots appear and move, most have a random trajectory but a given proportion of them move coherently to the same direction.
Both behavioral task (audience effect and vicarious reward) will be studied in fMRI (functional Magnetic Resonance Imagery). The same paradigms used in the behavioral experiment will be adapted for fMRI. Audience Effect experiment: trials will last for 10 seconds maximum. With 80 trials for each condition (public easy, public difficult, private easy and private difficult), the task will count a total of 320 trials and have a 54 minutes duration, in 3 runs of 17 minutes each. Vicarious Reward experiment: trials will have a 10 seconds maximum duration. Using 40 trials for each condition (other low payoff, other high payoff, self low payoff, self high payoff, control condition), the task will have a total of 200 trials and last for 54 minutes, in 6 runs of 9 minutes each. Both behavioral task (audience effect and vicarious reward) will be studied in MEG (MagnetoEncephaloGraphy). The same paradigms used in the behavioral experiment will be used in MEG. Audience Effect experiment: trials will last for 7 seconds maximum. With 100 trials for each condition (public easy, public difficult, private easy and private difficult), the task will count a total of 400 trials and have a 47 minutes duration. Every 100 trials (about 12 minutes of tasks), a break will be proposed to the participants. Vicarious Reward experiment: trials will have a 7.2 seconds maximum duration. Using 75 trials for each condition (other low payoff, other high payoff, self low payoff, self high payoff, control condition), the task will have a total of 375 trials and last for 45 minutes. Every 125 trials (every 15 minutes), a break will be proposed to the participants. |
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 |
---|---|---|
Modulation of the decisional parameter by the payoff conditions
大体时间:1 hour
|
behavioral data (reaction-times and accuracy) are collected and the decision parameter can be estimated from them using Drift Diffusion Models
|
1 hour
|
Modulation of the decisional parameter by the beneficiary conditions
大体时间:1 hour
|
behavioral data (reaction-times and accuracy) are collected and the decision parameter can be estimated from them using Drift Diffusion Models
|
1 hour
|
次要结果测量
结果测量 |
措施说明 |
大体时间 |
---|---|---|
Event-Related potentials
大体时间:1 hour
|
study of the time-locked brain activity
|
1 hour
|
Time-frequency brain responses
大体时间:1 hour
|
study of the oscillatory activity elicited in the brain
|
1 hour
|
BOLD
大体时间:1 hour
|
Variation of the blood-oxygen-level dependent (BOLD) signal
|
1 hour
|
合作者和调查者
调查人员
- 首席研究员:Caroline DEMILY, MD、CH Le Vinatier
研究记录日期
研究主要日期
学习开始 (实际的)
初级完成 (实际的)
研究完成 (实际的)
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
与本研究相关的术语
其他研究编号
- 69HCL16_0680
药物和器械信息、研究文件
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研究美国 FDA 监管的设备产品
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