顶内沟中的“什么”和“哪里”：对视觉短期记忆中物体身份和位置的 fMRI 研究。
"What" and "where" in the intraparietal sulcus: an FMRI study of object identity and location in visual short-term memory.
机构信息
Department of Psychology, Université de Montréal, Montréal, Québec H2V 2S9, Canada.
出版信息
Cereb Cortex. 2010 Oct;20(10):2478-85. doi: 10.1093/cercor/bhp314. Epub 2010 Jan 25.
Abstract
The intraparietal sulcus (IPS) has been closely linked to limitations of visual short-term memory capacity (VSTM; Todd and Marois 2004; Xu and Chun 2006). It is not clearly known, however, to what extent IPS activation reflects VSTM for object identity (What) versus spatial location (Where) information. The present study was designed to manipulate selectively the amount of What and Where information retained in VSTM in order to determine, using functional magnetic resonance imaging, the effect of VSTM for each of these 2 dimensions on IPS activation. The results showed an increase in IPS activation only in response to increasing Where memory load, with no effect of What load suggesting that capacity-related activation in the IPS primarily reflects the amount of spatial information retained in VSTM.
摘要
顶内沟（IPS）与视觉短期记忆容量（VSTM；Todd 和 Marois 2004；Xu 和 Chun 2006）的限制密切相关。然而，目前尚不清楚 IPS 的激活在何种程度上反映了 VSTM 中对象身份（What）与空间位置（Where）信息。本研究旨在有选择地操纵 VSTM 中保留的 What 和 Where 信息的数量，以便使用功能磁共振成像确定这两个维度中的每一个维度的 VSTM 对 IPS 激活的影响。结果表明，仅在响应于 Where 记忆负荷增加时 IPS 激活增加，而 What 负荷没有影响，这表明 IPS 中的与容量相关的激活主要反映了在 VSTM 中保留的空间信息的数量。
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