Object-based attention: Shifting or uncertainty?
Object-based attention: Shifting or uncertainty?
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DOI：
10.3758/app.72.7.1743
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发表时间：
2010-10-01
影响因子：
1.7
通讯作者：
Shomstein, Sarah
中科院分区：
文献类型：
--
作者：
Drummond, Leslie;Shomstein, Sarah
基于物体的注意引导对视觉处理的贡献被广泛接受，最近的注意选择模型现在包括基于空间和基于物体的表征。然而，尽管基于空间的注意选择机制已经得到了很好的表征，基于物体的注意选择机制仍然知之甚少。最近的尝试，在确定机制引起基于对象的注意选择提出了两个相互矛盾的选择。第一个表明，基于对象的效果是由注意力的不确定性驱动的（即，注意力优先化假设），而第二个假设表明只有当注意力转移是必要的时物体才引导注意力选择（即，注意力转移假说（Attention shifting hypothesis）。在这里，我们直接调查了这两个建议的帐户驱动基于对象的效果，对注意力转移的注意力确定性。在一系列的四个实验中，我们操纵的确定性目标位置，转移的注意力，和刺激的起始时间。据指出，基于物体的效果完全取决于即将出现的目标位置的确定性。这些结果表明，注意力的优先级，而不仅仅是注意力的转移，引起了基于对象的注意力选择的指导。此外，这些结果进一步支持了基于对象的注意的注意优先化解释，并对基于对象的选择机制提供了进一步的限制。
The contribution of object-based attentional guidance to visual processing is widely accepted, and recent models of attentional selection now include both space- and object-based representations. Nevertheless, although the mechanism of space-based attentional selection has been well characterized, the mechanism underlying object-based attentional selection remains poorly understood. Recent attempts at identifying the mechanism giving rise to object-based attentional selection have put forth two conflicting alternatives. The first suggests that object-based effects are driven by attentional uncertainty (i.e., the attentional prioritization hypothesis), whereas the second suggests that objects guide attentional selection only when an attentional shift is necessitated (i.e., the attentional-shifting hypothesis). Here, we directly investigated which of the two suggested accounts drives object-based effects, by pitting attentional certainty against attentional shifting. In a series of four experiments, we manipulated the certainty of target location, shifting of attention, and the stimulus onset asynchrony. It was observed that object-based effects depended solely on certainty of the forthcoming target location. These results suggest that attentional prioritization, and not a mere shift of attention, gives rise to object-based guidance of attentional selection. In addition, these results lend further support to the attentional prioritization account of object-based attention and provide further constraints on the mechanisms of object-based selection.