Storing fine detailed information in visual working memory-Evidence from event-related potentials
Storing fine detailed information in visual working memory-Evidence from event-related potentials
复制标题
在视觉工作记忆中存储精细的详细信息——来自事件相关电位的证据
DOI：
10.1167/9.7.17
复制
发表时间：
2009-01-01
影响因子：
1.8
通讯作者：
Shen, Mowei
中科院分区：
文献类型：
--
作者：
Gao, Zaifeng;Li, Jie;Shen, Mowei
视觉工作记忆（VWM）维护和操作在视觉处理中积极使用的一组有限的视觉对象。为了探讨VWM中是否以及如何存储精细的详细信息，在记录对侧延迟活动（CDA）的同时进行了四个实验，CDA是反映VWM中信息维护的事件相关电位差波。通过采用简单物体和复杂物体作为材料来操纵记忆信息的类型。我们发现CDA的幅度受到对象复杂性的调节：随着内存阵列的设置大小从2增加到4，CDA的幅度停止增加以维护具有详细信息的复杂对象，而继续增加以存储高度可辨别的简单对象。这些结果表明VWM可以存储精细的详细信息；然而，它无法存储 4 个复杂对象的所有详细信息。这意味着VWM的容量不仅仅由固定数量的对象来表征，至少有一个阶段受到对象中包含的详细信息的影响。这些结果在 VWM 的两阶段存储模型中进一步讨论：不同类型的感知信息（高度可辨别的特征和精细的细节特征）通过两种独特的机制在 VWM 中维护。
Visual working memory (VWM) maintains and manipulates a limited set of visual objects being actively used in visual processing. To explore whether and how the fine detailed information is stored in VWM, four experiments have been conducted while recording the contralateral delay activity (CDA), an event-related potential difference wave that reflects the information maintenance in VWM. The type of the remembered information was manipulated by adopting simple objects and complex objects as materials. We found the amplitude of CDA was modulated by object complexity: as the set size of memory array rose from 2 to 4, the amplitude of CDA stopped increasing for maintaining complex objects with detailed information, while continued increasing for storing highly discriminable simple objects. These results suggest that VWM can store the fine detailed information; however it can not store all the fine detailed information from 4 complex objects. It implies that the capacity of VWM is not only characterized by a fixed number of objects, there is at least one stage influenced by the detailed information contained in the objects. These results are further discussed within a two-stage storing model of VWM: different types of perceptual information (highly discriminable features and fine detailed features) are maintained in VWM via two distinctive mechanisms.