Weighted integration of visual position information.

Weighted integration of visual position information.
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DOI:
10.1167/11.14.11
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发表时间:
2011-12-01
期刊:
影响因子:
1.8
通讯作者:
Krekelberg B
Krekelberg B
中科院分区:
医学4区
文献类型:
--
作者:
Wright JM;Morris AP;Krekelberg B

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定位视觉对象的能力是人类行为的基本组成部分,并且需要集成来自对象组件的位置信息。刺激的视网膜偏心率和空间注意轨迹可以影响物体定位,但目前尚不清楚这些因素是改变物体的全局定位,还是改变物体成分的定位,还是两者兼而有之。我们在人体中使用心理物理学方法来量化质心估计任务中的行为反应。受试者定位了短暂呈现的随机点图案(RDPs)的质心。外围提示被用来将注意力偏向显示器的一侧。我们发现,尽管受试者能够可靠地定位质心位置,但他们通常偏向中心凹,并向注意中心转移。我们比较了解释这些影响的定量模型,这些模型要么解释为RDPS的偏向全球局部化,要么解释为加权网点分量位置的各向异性积分。一个模型允许视网膜偏心率和空间注意力改变分配给各个点位置的权重,这一模型最好地解释了受试者的表现。这些结果表明,全局位置知觉既取决于刺激成分的视网膜偏心率,也取决于它们相对于当前注意焦点的位置。
The ability to localize visual objects is a fundamental component of human behavior and requires the integration of position information from object components. The retinal eccentricity of a stimulus and the locus of spatial attention can affect object localization, but it is unclear whether these factors alter the global localization of the object, the localization of object components, or both. We used psychophysical methods in humans to quantify behavioral responses in a centroid estimation task. Subjects located the centroid of briefly presented random dot patterns (RDPs). A peripheral cue was used to bias attention towards one side of the display. We found that although subjects were able to localize centroid positions reliably, they typically had a bias towards the fovea and a shift towards the locus of attention. We compared quantitative models that explain these effects either as biased global localization of the RDPs or as anisotropic integration of weighted dot component positions. A model that allowed retinal eccentricity and spatial attention to alter the weights assigned to individual dot positions best explained subjects’ performance. These results show that global position perception depends on both the retinal eccentricity of stimulus components and their positions relative to the current locus of attention.
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