Spinning objects and partial occlusion: Smart neural responses to symmetry
Spinning objects and partial occlusion: Smart neural responses to symmetry
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DOI：
10.1016/j.visres.2021.06.009
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发表时间：
2021-07-13
期刊：
影响因子：
1.8
通讯作者：
Bertamini，Marco
中科院分区：
文献类型：
--
作者：
Rampone，Giulia;Makin，Alexis D. J.;Bertamini，Marco
在人类中，对称性会强烈激活纹外视觉区。然而，完美的对称性在自然视觉图像中是罕见的。最近的研究表明，当对称形状的部分在不同的时间点呈现时，这个过程依赖于感知记忆缓冲区。这种时间整合是否需要视网膜定位参照系？我们第一次测试整合的部分在时间和空间域，使用非retinotopic参考系。在实验1中，一个不规则的多边形形状（对称或不对称）被部分封闭的矩形为500毫秒（T1）。该矩形移动到对面以显示形状的另一半，同时遮挡之前可见的一半（T2）。物体的参照系是静态的：两个部分刺激视网膜相应的感受野（随着时间的推移显示）。观察到T2后约300 ms的脑特异性ERP反应。在实验2中，在T2时将动态咬合与附加步骤相结合：将新的半形状和封堵器旋转90°。因此，有一个移动的参照系，两部分之间的视网膜对应被破坏。记录了较弱但显著的特异性反应。这一结果扩展了以前的研究结果：整体对称性表征可以实现在纹外区的非retinotopically，通过整合在时间和空间域。
In humans, extrastriate visual areas are strongly activated by symmetry. However, perfect symmetry is rare in natural visual images. Recent findings showed that when parts of a symmetric shape are presented at different points in time the process relies on a perceptual memory buffer. Does this temporal integration need a retinotopic reference frame? For the first time we tested integration of parts both in the temporal and spatial domain, using a non-retinotopic frame of reference. In Experiment 1, an irregular polygonal shape (either symmetric or asymmetric) was partly occluded by a rectangle for 500 ms (T1). The rectangle moved to the opposite side to reveal the other half of the shape, whilst occluding the previously visible half (T2). The reference frame for the object wasstatic: the two parts stimulated retinotopically corresponding receptive fields (revealed over time). A symmetry-specific ERP response from ~300 ms after T2 was observed. In Experiment 2 dynamic occlusion was combined with an additional step at T2: the new half-shape and occluder were rotated by 90°. Therefore, there was a moving frame of reference and the retinal correspondence between the two parts was disrupted. A weaker but significant symmetry-specific response was recorded. This result extends previous findings: global symmetry representation can be achieved in extrastriate areas non-retinotopically, through integration in both temporal and spatial domain.