Spatial selection of features within perceived and remembered objects

被引:27
作者
Astle, Duncan E. [1 ]
Scerif, Gaia [1 ]
Kuo, Bo-Cheng [1 ]
Nobre, Anna C. [1 ]
机构
[1] Univ Oxford, Dept Expt Psychol, Oxford OX1 3UD, England
来源
FRONTIERS IN HUMAN NEUROSCIENCE | 2009年 / 3卷
基金
英国经济与社会研究理事会; 英国惠康基金;
关键词
spatial attention; visual short-term memory; working memory; ERPs; electrophysiology; task-set control; WORKING-MEMORY; NEURAL MECHANISMS; N2PC COMPONENT; VISUAL-SEARCH; ATTENTION; CAPTURE; TASK;
D O I
10.3389/neuro.09.006.2009
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Our representation of the visual world can be modulated by spatially specific attentional biases that depend flexibly on task goals. We compared searching for task-relevant features in perceived versus remembered objects. When searching perceptual input, selected task-relevant and suppressed task-irrelevant features elicited contrasting spatiotopic ERP effects, despite them being perceptually identical. This was also true when participants searched a memory array, suggesting that memory had retained the spatial organization of the original perceptual input and that this representation could be modulated in a spatially specific fashion. However, task-relevant selection and task-irrelevant suppression effects were of the opposite polarity when searching remembered compared to perceived objects. We suggest that this surprising result stems from the nature of feature- and object-based representations when stored in visual short-term memory. When stored, features are integrated into objects, meaning that the spatially specific selection mechanisms must operate upon objects rather than specific feature-level representations.
引用
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页数:9
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