在探索-利用决策和自杀企图期间,前额头和皮质下价值表示.
bioRxiv : the preprint server for biology
|November 24, 2025
概括
患有抑郁症的老年人的自杀行为与大脑对奖励价值的反应改变有关. 基于自杀企图的死亡率,出现了不同的模式,这表明了不同的神经生物学途径.
科学领域:
- 神经科学是一个神经科学.
- 精神病学是一个精神病学.
- 决策科学 决策科学 决策科学
背景情况:
- 晚年抑郁症是自杀行为的重要危险因素.
- 了解自杀行为中决策的神经生物学基础至关重要.
研究的目的:
- 研究与抑郁症老年人的自杀行为相关的奖励值编码的时间动态.
- 为了区分与自杀企图的不同致死率相关的神经生物学特征.
主要方法:
- 追溯病例控制研究,涉及134名老年人.
- 在功能性MRI (fMRI) 期间使用了探索-利用决策任务.
- 应用多层模型来分析fMRI时间序列,专注于奖励值编码.
主要成果:
- 自杀行为与形腹前额叶皮层 (vPFC) 值信号相关.
- 与默认网络 (vPFC,纹状体,杏仁体,海马体) 中废除的值更新响应相关的低死亡率尝试.
- 高致死率的试验显示在vPFC,状体和海马中持续呈现负值反应.
结论:
- 不同的与决策相关的神经反应可能表明导致自杀行为的不同途径.
- 低死亡率试验中值更新受损表明未能整合结果,可能会增加应激反应能力.
- 在高致死率的尝试者中,控制网络活动的增加可能反映出认知收缩和有限的解决问题能力.
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