Texture segmentation influences the spatial profile of presaccadic attention.
Texture segmentation influences the spatial profile of presaccadic attention.
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DOI：
10.1167/17.2.10
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发表时间：
2017-02-01
影响因子：
1.8
通讯作者：
Verghese P
中科院分区：
文献类型：
--
作者：
Ghahghaei S;Verghese P
注意力对于选择行动目标很重要。一些研究表明，注意力选择先于眼球运动到目标，并导致眼跳目标的敏感性增强。这些研究通常使用空白背景上的孤立目标，这在现实世界中很少见。在这里，我们研究的空间轮廓的敏感性周围的眼跳目标的纹理背景，以及如何随着时间的推移，周围的环境的影响发展。我们使用了两种纹理背景：一种是均匀的纹理，另一种是具有正交方向的内部纹理和外部纹理的同心排列。为了比较，我们还测量了空白背景上目标周围的灵敏度。用一个短暂的、昏暗的探头在扫视目标周围闪烁，测量敏感度的空间分布。当目标是一个空白或均匀纹理的背景，空间灵敏度达到峰值附近的目标位置约350毫秒后，线索发病和下降与距离的目标。然而，当背景由内部和外部纹理组成时，对内部纹理的敏感性一致地高，在提示开始后约350 ms处达到峰值，这表明整个内部纹理与目标一起被选择沿着。当观察者隐蔽地注视目标并执行探测任务时，对内部纹理的敏感性增强要小得多。因此，我们的研究结果表明，考虑到周围的目标的表面表示时，观察者积极计划与目标进行交互。
Attention is important for selecting targets for action. Several studies have shown that attentional selection precedes eye movements to a target, and results in an enhanced sensitivity at the saccade goal. Typically these studies have used isolated targets on blank backgrounds, which are rare in real-world situations. Here, we examine the spatial profile of sensitivity around a saccade target on a textured background and how the influence of the surrounding context develops over time. We used two textured backgrounds: a uniform texture, and a concentric arrangement of an inner and an outer texture with orthogonal orientations. For comparison, we also measured sensitivity around the target on a blank background. The spatial profile of sensitivity was measured with a brief, dim, probe flashed around the saccade target. When the target was on a blank or a uniformly textured background, spatial sensitivity peaked near the target location around 350 ms after cue onset and declined with distance from the target. However, when the background was made up of an inner and outer texture, sensitivity to the inner texture was uniformly high, peaking at about 350 ms after cue onset, suggesting that the entire inner texture was selected along with the target. The enhancement of sensitivity on the inner texture was much smaller when observers attended the target covertly and performed the probe-detection task. Thus, our results suggest that the surface representation around the target is taken into account when an observer actively plans to interact with the target.