When does perceptual organization happen?
When does perceptual organization happen?
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DOI：
10.1016/j.cortex.2024.02.007
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发表时间：
2024-03-16
期刊：
影响因子：
3.6
通讯作者：
Bertamini，Marco
中科院分区：
文献类型：
--
作者：
Makin，Alexis D. J.;Buckley，Ned;Bertamini，Marco
反射（镜像）对称是感知组织的重要视觉线索。大脑快速有效地处理对称性。先前的研究表明，对称性激活了纹外皮层，并产生了一种称为持续后负波（SPN）的事件相关电位（ERP）。有人声称，没有任务完全阻止对称性处理和废除SPN。我们通过一系列八个新的脑电图（EEG）实验（总共344名参与者）来测试这一说法的局限性。所有实验都使用相同的对称或不对称点图案。在实验1中，当参与者注意规律性时，存在显著的SPN（平均幅度=-2.423 μV）。在实验2和实验3中，当被试辨别圆点亮度（-0.835和-1.410 μV），或者在实验4和实验5中辨别叠加十字的纵横比（-0.722和-0.601 μV）时，SPN会减少，但不会消失。在实验6（-1.358 μV）中，当背景图案对主要任务具有潜在破坏性时，以及在实验7（-0.510 μV）中，当参与者对负面叠加词进行分类时，SPN也存活了下来。最后，在实验8（-0.589 μV）中，当参与者注意对角线方向时，SPN仍然存在。虽然任务操作可以降低纹外对称激活，但它们不能使系统完全无反应。永久准备检测视野中心的反射对称性可能是一种进化适应。
Reflectional (mirror) symmetry is an important visual cue for perceptual organization. The brain processes symmetry rapidly and efficiently. Previous work suggests that symmetry activates the extrastriate cortex and generates an event related potential (ERP) called theSustained Posterior Negativity(SPN). It has been claimed that no tasks completely block symmetry processing and abolish the SPN. We tested the limits of this claim with a series of eight new Electroencephalography (EEG) experiments (344 participants in total). All experiments used the same symmetrical or asymmetrical dot patterns. When participants attended to regularity in Experiment 1, there was a substantial SPN (Mean amplitude = −2.423 μV). The SPN was reduced, but not abolished, when participants discriminated dot luminance in Experiments 2 and 3 (−.835 and −1.410 μV) or the aspect ratio of a superimposed cross in Experiments 4 and 5 (−.722 and −.601 μV). The SPN also survived when the background pattern was potentially disruptive to the primary task in Experiment 6 (−1.358 μV) and when participants classified negative superimposed words in Experiment 7 (−.510 μV). Finally, the SPN remained when participants attended to the orientation of a diagonal line in Experiment 8 (−.589 μV). While task manipulations can turn down the extrastriate symmetry activation, they cannot render the system completely unresponsive. Permanent readiness to detect reflectional symmetry at the centre of the visual field could be an evolved adaptation.