工作记忆负载的神经认知作用,当帕夫洛夫式的动机控制影响工具学习时
Heesun Park1, Hoyoung Doh1, Eunhwi Lee1
1Department of Psychology, Seoul National University, Seoul, Korea.
PLoS computational biology
|December 8, 2023
概括
工作记忆 (WM) 的认知负载减缓了仪器学习,并通过削弱大脑连接来增加随机选择. 然而,这种负载并没有改变帕夫洛夫学习对行为的影响.
科学领域:
- 认知神经科学 认知神经科学
- 神经经济学 神经经济学
背景情况:
- 仪器学习受到工作记忆 (WM) 和强化学习 (RL) 系统的影响.
- 帕夫洛夫学习提供了与生俱来的反应,可以与仪器学习相互作用.
- 在帕夫洛夫的影响下,WM负载对仪器学习的影响仍然不清楚.
研究的目的:
- 调查工作记忆 (WM) 负载如何影响仪器学习,当它与帕夫洛夫暗示冲突.
- 使用fMRI检查这些影响背后的神经机制.
主要方法:
- 一项功能磁共振成像 (fMRI) 研究,共有49名参与者.
- 参与者在不同的WM负载条件下执行了Pavlovian-instrumental冲突的乐器学习任务.
- 分析了行为数据和计算建模,以及基于模型的fMRI.
主要成果:
- WM负载降低了学习速度,增加了随机行动选择.
- WM负载没有影响帕夫洛夫偏差.
- 在WM负载下,fMRI揭示了在纹状体中强化奖励预测错误 (RPE) 信号.
- 在奖励期望计算过程中,WM负载削弱了与前额叶皮层区域的条状连接.
结论:
- 来自WM负载的认知资源限制通过削弱WM-RL合作来削弱仪器学习,导致学习速度减慢和更多的随机选择.
- WM负载会影响奖励期望的神经处理,但不会改变仪器学习系统和帕夫洛夫学习系统之间的平衡.
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