在帕金森病无动于衷时,基于价值的决策受损
William Gilmour1,2, Graeme Mackenzie1,2, Mathias Feile3
1Division of Imaging Science and Technology, Ninewells Hospital and Medical School, University of Dundee, Dundee DD1 9SY, UK.
Brain : a journal of neurology
|February 2, 2024
概括
帕金森病的无动于衷会损害基于价值的学习和决策,表现为奖励敏感度降低. 在非无情的患者中可能存在补偿性大脑机制.
科学领域:
- 神经科学是一个神经科学.
- 认知科学 认知科学
- 神经学 神经学
背景情况:
- 漠不关心是一种常见的,致残的帕金森病并发症,与前额叶皮和脑干神经调节器功能障碍 (多巴胺,血清素,上腺素) 有关.
- 神经调节器会影响有动机的决策,包括价值编码和探索与利用策略.
- 以前的研究表明,这些神经调节器对于目标导向行为至关重要,而这种行为在冷漠中会受到损害.
研究的目的:
- 调查帕金森病中冷漠与基于价值的学习受损相关的假设.
- 检查帕金森病患者的决策过程和神经相关物,有和没有冷漠.
主要方法:
- 75名参与者 (53名帕金森病患者,22名对照者) 接受了一项四臂不安强盗强化学习任务.
- 计算建模分析了选择行为,以评估学习和决策策略.
- 功能性MRI (fMRI) 用于检查59名参与者在执行任务期间的大脑活动.
主要成果:
- 帕金森病无动于衷的患者表现出选择最高值选项的能力受损,并且对学习的选项值无动于衷.
- 漠不关心的严重程度与高价值选项的利用率下降和坚持下降相关.
- fMRI显示,在帕金森病中,中腹前额皮层活化减弱,在冷漠中更为明显.
- 没有无动于衷的帕金森病患者表现出增加的甲状腺皮层网络激活,这可能是一种补偿机制.
结论:
- 帕金森病中的冷漠是以基于价值的学习和决策的缺陷为特征,包括奖励不敏感性.
- 泰拉马斯,背部前带状皮层和前胰岛的神经活动可能在缓解冷漠症症状方面发挥补偿作用.
- 了解这些神经机制可以为帕金森病中的冷漠提供有针对性的干预措施.
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