Temporal limits of spatial working memory in humans
Temporal limits of spatial working memory in humans
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DOI：
10.1046/j.1460-9568.1998.00101.x
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发表时间：
1998-02-01
影响因子：
3.4
通讯作者：
Pierrot-Deseilligny, C
中科院分区：
文献类型：
--
作者：
Ploner, CJ;Gaymard, B;Pierrot-Deseilligny, C
工作记忆的一个基本特征是其表征的不稳定性和短暂性。在记忆延迟0.5 ~ 30秒后，我们用眼电眼图记录了16名正常受试者的眼球运动（记忆引导扫视）。研究发现，跳眼定位误差在20秒左右出现峰值，最大误差出现在20秒左右，这表明工作记忆中的空间信息发生了与延迟相关的衰减，但有时间限制，在20秒左右的延迟后显著恢复。这些数据(i)表明空间工作记忆的时间限制，（ii）提供了第一个行为证据，证明存在两种平行产生的空间心理表征，它们先后控制着人类记忆引导的行为。
An essential feature attributed to working memory is the labile and transient nature of its representations. Using an oculomotor task, we examined the stability of spatial working memory in 16 normal human subjects, Eye movements towards remembered spatial cues (memory-guided saccades) were electro-oculographically recorded after memorization delays that varied unpredictably between 0.5 and 30 s. A peaked time-course of saccadic targeting errors, with maximal errors around 20 s delay, was found, showing that delay-dependent decay of spatial information in working memory occurs, but is time-limited and reverts significantly beyond delays of about 20 s. These data (i) indicate temporal limits of spatial working memory and (ii) provide the first behavioural evidence for the existence of two parallely generated mental representations of space that successively control memory-guided behaviour in humans.