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在奖励预期期间,特征奖励敏感性和行为动机塑造了默认模式网络和条纹体之间的连接
James B Wyngaarden1, Akanksha Nambiar2, Jeffrey Dennison3
1Temple University.
bioRxiv : the preprint server for biology
|July 14, 2025
概括
奖励灵敏度的个体差异与大脑网络连接有关. 在奖励预期过程中,行为动机影响了腹状条纹体 (VS) 和默认模式网络 (DMN) 之间的这种连接.
科学领域:
- 神经科学是一个神经科学.
- 认知神经科学 认知神经科学
- 神经成像是一种神经成像.
背景情况:
- 个人对奖励和动机的反应有很大的不同.
- 腹状条纹体 (VS) 对于奖励预期至关重要.
- VS与默认模式网络 (DMN) 之间的连接参与了奖励处理,但其与个人差异的联系尚不清楚.
研究的目的:
- 研究特征奖励敏感性和行为动机如何影响奖励预期期间的DMN-VS连接.
- 澄清奖励处理中的个体差异背后的神经机制.
主要方法:
- 在46名参与者的货币激励延迟 (MID) 任务中进行fMRI扫描.
- 通过反应时间和自我报告的奖励灵敏度和无情感评估行为动机.
- 在奖励预期期间检查了DMN和VS之间的连接.
主要成果:
- 在奖励- Salient 试验中,更高的奖励灵敏度与更大的 DMN-VS 连接度相关.
- 行为动机调节了这种关系:高动机与奖励敏感个体的DMN-VS连接性降低有关.
- 较低的行为动机减弱了奖励敏感性和DMN-VS连接性之间的关联.
结论:
- 行为动机是理解奖励预期期间的DMN-状交互的关键因素.
- 这些发现为奖励处理中的个人差异的神经基础提供了新的见解.
- 考虑动机背景对于研究奖励相关的神经机制至关重要.
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