减少神经编码在可卡因成中的实用性预测错误
Anna B Konova1, Ahmet O Ceceli2, Guillermo Horga3
1Department of Psychiatry, University Behavioral Health Care & the Brain Health Institute, Rutgers University-New Brunswick, Piscataway, NJ 08855, USA.
Neuron
|October 26, 2023
概括
患有可卡因成的个体在大脑中,特别是腹状条纹体中,显示出功用预测错误 (PE) 的减少. 这种干扰源于对预期奖励的反应减少,影响了适应性行为.
科学领域:
- 神经科学是一个神经科学.
- 成研究 研究成研究
- 计算精神病学是一种计算精神病学.
背景情况:
- 理论上,成涉及多巴胺基预测错误 (PEs) 的缺陷,这表明预期和实际奖励之间的差异.
- 多巴胺神经元将这些信号编码为"实用性"PE,受个人风险偏好的影响,但成中PE缺陷的来源尚不清楚.
研究的目的:
- 调查慢性可卡因成的个体是否表现出实用PE的缺陷.
- 为了确定大脑中这些潜在的预测错误缺陷的计算来源.
主要方法:
- 利用功能磁共振成像 (fMRI) 来测量在任务期间的大脑活动,类似于单单元电生理学研究.
- 评估预测错误 (PE) 反映主观效用,比较患有慢性可卡因成的个体与对照参与者.
主要成果:
- 与对照人群相比,慢性可卡因成的个体在腹状条纹体中显著减少了PEs的效用.
- 在轨道前皮层中观察到类似的减少效用PE的趋势.
- 实用性PE的减少归因于对收到的奖励/实用性的条形状反应较弱,而不是对奖励期望的改变反应.
结论:
- 成可能从根本上破坏大脑奖励回路中的预测错误信号.
- 感知到的奖励价值在成背后的神经生物学机制中起着关键的,被低估的作用.
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