在创伤后精神病理学中改变了杏仁体和条形状反应和预测错误编码的时间奖励动态
Lauren K Enten1, Annamarie DeMarco1, Rachel Kline1
1Department of Psychiatry and Behavioral Sciences, The University of Texas at Austin Dell Medical School, Austin, TX, USA.
概括
患有创伤后精神病理 (PTP) 的人表现出改变的大脑反应,以奖励时间预测错误. 这种功能障碍会影响大脑关键区域的学习和奖励处理,如杏仁体和骨.
科学领域:
- 神经科学是一个神经科学.
- 计算精神病学是一种计算精神病学.
- 心理学 心理学 心理学
背景情况:
- 减弱的积极影响是创伤后精神病理 (PTP) 的特征,包括创伤后应激障碍和严重抑郁症.
- 了解PTP症状背后的神经回路,特别是奖励处理和学习,至关重要,但仍然不完整.
研究的目的:
- 通过使用功能磁共振成像 (fMRI) 来研究PTP患者对时间预测错误的神经反应性.
- 在PTP和健康对照组中使用时间差 (TD) 学习模型来描述基于模型的预测错误神经编码.
主要方法:
- 利用fMRI测量奖励时间预测任务期间的大脑活动,包括视觉提示和果汁奖励.
- 引入了时间预测错误,通过在"捕捉"试验中意外推迟奖励交付.
- 应用了一种TD学习模型来分析杏仁体,膜和岛膜中预测错误的神经编码.
主要成果:
- 与对照组相比,患有PTP的个体表现出的杏仁体和膜激活到意想不到的奖励交付和的停用到意想不到的奖励缺席.
- 在PTP中减弱的杏仁体失活与较低的无情感水平相关.
- 基于模型的fMRI显示,在奖励交付时,杏仁体和门预测错误编码减少,但在PTP中,在提示呈现时,胰岛和门编码过度.
结论:
- 这项研究提供了证据,证明了PTP中桃体-状腺奖励响应和计算学习信号的破坏.
- 功能障碍扩展到基本的学习领域,特别是提示奖励时间,突出显示了在PTP中对学习和奖励处理的普遍影响.
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