奖励的积极性对加强值不敏感
bioRxiv : the preprint server for biology
|April 16, 2025
概括
当食物奖励值因腹而下降时,奖励积极性 (RewP) 脑信号不会改变. 这表明RewP对影响奖励感知的动机状态变化不敏感.
科学领域:
- 神经科学是一个神经科学.
- 认知科学 认知科学
- 决策科学 决策科学 决策科学
背景情况:
- 行为适应依赖于评估与内部状态相对的奖励结果.
- 奖励积极性 (RewP) 是一种与奖励价值和动机相关的电生理学标记.
- 目前尚不清楚RewP是否反映了由动机状态调节的奖励价值的变化.
研究的目的:
- 调查RewP的变化是否受到奖励价值变化的影响,作为动机状态的函数.
- 检查RewP对感官特异性感诱导的食物奖励值的敏感性.
主要方法:
- 在EEG记录期间,参与者 (n=31) 接受了Pavlovian调节,使用甜味和味食物增强剂.
- 一个强化器值任务 (感官特异性腹感) 被采用,通过给参与者一个食物养腹感.
- 在值之前和之后,分析了行为选择 (赢-停留/输-切换) 和电生理数据 (RewP).
主要成果:
- 参与者表现出特定的感官值,将足的食物评为不那么愉快.
- 行为数据显示,值后的食物偏好发生了调整,这表明基于推断的行为.
- 在强化器值之前和之后,没有发现 RewP 幅度的显著差异.
结论:
- 奖励积极性 (RewP) 似乎对由动机状态 (足) 驱动的奖励价值的推断变化不敏感.
- 情感和动机因素,特别是追踪奖励价值的下降,不会调节 RewP.
- 这些发现挑战了RewP作为动机状态依赖奖励估值的直接指标的作用.
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