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低优先级项目被保留在视觉工作记忆中:在两种替代性强制选择 (2AFC) 范式中的灵活分配的证据
Holly A Lockhart1,2, Stephen M Emrich1,3
1Department of Psychology, Brock University, St. Catharines, ON, Canada.
Journal of vision
|March 7, 2025
概括
视觉工作记忆 (VWM) 容量有限,但即使探测概率低,也存在低分辨率表示. 这表明内存资源是分布的,而不是完全不存在的.
科学领域:
- 认知心理学 认知心理学
- 神经科学是一个神经科学.
- 人类的感知 人类的感知
背景情况:
- 视觉工作内存 (VWM) 被认为是容量有限的,其证据是内存任务中的性能下降和平面错误分布.
- 连续资源模型建议可以分配有限的VWM资源,从而产生具有潜在均错误分布的低分辨率表示.
研究的目的:
- 调查VWM中低概率项是否以低分辨率存储在内存中,而不是缺席.
- 测试使用操纵的内存资源分配对VWM连续资源模型的预测.
主要方法:
- 通过改变一个项目在回忆过程中被探测的概率来操纵内存资源分配.
- 通过连续估计和两个替代性强制选择 (2AFC) 试验的组合收集了答案.
- 操纵了目标和诱颜色之间的区分难度,以与连续响应分布进行比较.
主要成果:
- 2AFC试验的准确性受到歧视难度和探测概率的影响.
- 即使在最小的探针概率条件 (10%) 中也观察到高于概率的性能,这表明低分辨率的内存表示.
- 这些发现与预测分布式内存资源的连续资源模型一致.
结论:
- VWM可能没有严格的容量限制,而是利用分布式资源,导致低优先级项目的低分辨率表示.
- 该研究支持VWM的连续资源和信号检测模型,挑战纯粹离散容量观点.
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