上向下任务目标诱导检索状态
1Department of Psychology, University of Virginia, Charlottesville, VA 22904.
概括
上向下目标是识别物品,独立于刺激的重复,参与检索状态. 这表明内部注意力驱动记忆检索,影响认知处理.
科学领域:
- 认知神经科学 认知神经科学
- 记忆研究 记忆研究
- 人类心理学 人类心理学
背景情况:
- 检索状态影响认知处理和行为.
- 在引入检索状态时,自上而下 (目标) 和自下而上 (刺激属性) 因素之间的相互作用尚未完全理解.
- 了解这些因素对于解释大脑状态控制如何影响认知至关重要.
研究的目的:
- 调查自上而下的目标和自下而上的刺激特性对恢复状态参与的独立和联合影响.
- 为了确定与任务相关的与与任务无关的大脑状态如何影响记忆识别.
- 为了澄清引发检索状态的机制.
主要方法:
- 人类参与者执行了识别记忆任务,测试阶段的目标各不相同.
- 头皮脑电图 (EEG) 被记录下来.
- 使用独立验证的记忆状态分类器,根据任务目标和刺激重复 (成功与正确拒绝) 来测量检索状态参与度.
主要成果:
- 检索状态被用于击中目标,不管是上下目标.
- 在正确的拒绝过程中,只有当目标是识别旧物品时,检索状态才会被启动.
- 当目标是识别旧项目时,在低信任度的命中中,检索状态的参与度高于高信任度的命中.
结论:
- 上向下要求识别旧物品可以独立于自下而上的刺激因素来诱导检索状态.
- 这表明,内部的注意力可能被招募来促进存储的记忆表征的访问.
- 这些发现为对大脑状态的控制及其对记忆识别等认知功能的影响提供了关键的见解.
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