Neural responses to reflection symmetry for shapes defined by binocular disparity, and for shapes perceived as regions of background.
Neural responses to reflection symmetry for shapes defined by binocular disparity, and for shapes perceived as regions of background.
复制标题
对于由双眼视差定义的形状以及被感知为背景区域的形状的反射对称性的神经反应。
DOI：
10.1016/j.neuropsychologia.2021.108064
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发表时间：
2021
期刊：
影响因子：
2.6
通讯作者：
Karakashevska E
中科院分区：
文献类型：
--
作者：
Karakashevska E
人类对对称性的感知与纹状体外视觉区域的扩展网络中的激活有关。这种激活产生称为持续性后负波(SPN)的事件相关电位。在迄今为止的大多数研究中，刺激都是由亮度来定义的。我们使用随机点立体图(RDS)测试了当刺激由立体视差定义时是否存在SPN。在实验1中，我们比较了由双眼视差指定的轮廓和由单眼线索指定的轮廓的SPN信号。SPN是等价的，表明等高线的类型不改变SPN信号。在实验2WE中，我们利用RDS的独特属性来提供明确的图形-背景安排。心理物理学研究表明，与两个物体(即地面)之间的间隙属性相比，当对称性是单个对象的属性时(即，在图形内)，更容易检测到对称性。因此，本实验中的目标区域可以是前景，也可以是背景。当对称性位于地面区域时，SPN的起始延迟。这可能是因为对象形成干扰了地面区域中的形状信息的处理。
Human perception of symmetry is associated with activation in an extended network of extrastriate visual areas. This activation generates an ERP called the Sustained Posterior Negativity (SPN). In most studies so far, the stimuli have been defined by luminance. We tested whether the SPN is present when stimuli are defined by stereoscopic disparity using random dot stereograms (RDS). InExperiment 1, we compared the SPN signal for contours specified by binocular disparity and contours specified by monocular cues. The SPN was equivalent, suggesting that the type of contour does not alter the SPN signal. InExperiment 2we exploited the unique property of RDS to provide unambiguous figure-ground arrangements. Psychophysical work has shown that symmetry is more easily detected when it is a property of a single object (i.e., within a figure), compared to a property of a gap between two objects (i.e., the ground). Therefore, the target regions in this experiment could either be foreground or background. The SPN onset was delayed when the symmetry was in a ground region. This may be because object formation interferes with the processing of shape information in the ground region.