补充前运动区域加强了在间选择中的奖励灵敏度
Gizem Vural1, Natasha Katruss1, Alexander Soutschek1
1Department for Psychology, Ludwig-Maximilians-Universität Munich, Munich, Germany.
NeuroImage
|September 6, 2024
概括
前补充性运动区 (前SMA) 通过增加对奖励价值的敏感性,在延迟满足方面发挥着关键作用. 这个大脑区域影响时间间的决策,促进选择更大的奖励.
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
- 决策科学 决策科学 决策科学
背景情况:
- 时间间决策的研究主要集中在背侧前额叶皮层.
- 补充前运动区域 (SMA前) 和后壁皮质 (PPC) 在延迟满足方面的作用仍然不清楚.
- 之前的研究不一致地将SMA前和PPC与证据积累,选择偏见或响应谨慎联系起来.
研究的目的:
- 调查前SMA和PPC对时间间决策的因果贡献.
- 确定前SMA在基于价值的选择中的特定计算作用.
- 在决策过程中区分预SMA和PPC的拟议功能.
主要方法:
- 结合漂移扩散模型 (DDM) 与在线跨磁刺激 (TMS).
- 在时间间决策任务期间,在SMA前和PPC上应用TMS.
- 使用DDM分析行为数据以建模证据积累,选择偏差和响应谨慎.
主要成果:
- 在SMA前活动的干扰显著减少了对更大的奖励的偏好.
- 在PPC上应用的TMS没有观察到强大的效果.
- DDM分析表明,SMA前刺激增加了奖励大小在证据积累中的权重,而没有改变选择偏差或响应谨慎.
结论:
- 预SMA因果影响时间间的选择,通过调节灵敏度以奖励大小.
- 预SMA的作用是特别是在基于奖励的决策的证据积累期间增强价值信号.
- 这些发现阐明了SMA前的计算功能,在促进选择更大的,尽管延迟的奖励方面.
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