模糊的奖励预测错误编码驱动器 减少与创伤性脑损伤相关的冷漠探索的动机
medRxiv : the preprint server for health sciences
|September 5, 2025
概括
在创伤性脑损伤 (TBI) 患者中, 漠不关心的原因既是对努力的厌恶, 也是对未来的决策受损. 降低TBI患者的奖励预测错误 (RPE) 信号阻碍了对新机遇的学习,影响了动机.
科学领域:
- 神经科学
- 认知心理学
- 临床神经学
背景情况:
- 临床冷漠的特点是动机减少,可能是由于努力厌恶或对未来回报的探索受损.
- 慢性创伤性脑损伤 (TBI) 经常与冷漠有关,需要对其潜在的认知和神经机制进行调查.
研究的目的:
- 在动机选择任务中使用fMRI研究慢性TBI患者的冷漠的认知和神经基础.
- 在TBI相关的冷漠中区分基于努力的决策缺陷和受损的面向未来的探索.
主要方法:
- 基于任务的功能性磁共振成像 (fMRI) 用于评估TBI患者和健康对照者的动机选择计算.
- 参与者完成了一项努力与价值的权衡任务 ("果任务") 和一项探索与利用的权衡任务 ("新鲜事物组合任务").
- 分析了与冷漠度相关的行为数据和神经活动.
主要成果:
- 在TBI和CTRL组中,较高的无动于衷与基于努力的奖励折扣增加以及对努力成本的神经编码增加相关.
- 在TBI患者中,冷漠与对未来奖励信息的评价降低有关,而不是直接价值学习受损.
- 这种TBI缺陷与前额皮层和基底细胞在反处理过程中缩的奖励预测错误 (RPE) 相关.
结论:
- 无动于衷可能涉及两种机制:对努力的普遍厌恶,以及在TBI中独特的,以未来为导向的决策.
- 在TBI患者中抑制RPE信号会降低学习信号,阻碍探索新机遇并降低未来的动力.
- 针对与RPE相关的神经网络提供了一个潜在的途径,用于改善TBI中的神经调节干预.
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