School of Psychology, University of East Anglia, Norwich Research Park, Norwich, NR4 7TJ, United Kingdom; Department of Psychological Sciences, Eleanor Rathbone Building, University of Liverpool, Liverpool L69 7ZA, United Kingdom.
Department of Psychological Sciences, Eleanor Rathbone Building, University of Liverpool, Liverpool L69 7ZA, United Kingdom.
Neuroimage. 2024 Apr 15;290:120568. doi: 10.1016/j.neuroimage.2024.120568. Epub 2024 Mar 16.
Visual symmetry at fixation generates a bilateral Event Related Potential (ERP) called the Sustained Posterior Negativity (SPN). Symmetry presented in the left visual hemifield generates a contralateral SPN over the right hemisphere and vice versa. The current study examined whether the contralateral SPN is modulated by the focus of spatial attention. On each trial there were two dot patterns, one to the left of fixation, and one to the right of fixation. A central arrow cue pointed to one of the patterns and participants discriminated its regularity (symmetry or random). We compared contralateral SPN amplitude generated by symmetry at attended and unattended spatial locations. While the response to attended symmetry was slightly enhanced, the response to unattended symmetry was still substantial. Although visual symmetry detection is a computational challenge, we conclude that the brain processes visual symmetry in unattended parts of the visual field.
注视时的视觉对称会产生一种称为持续后负向波（SPN）的双侧事件相关电位（ERP）。左视野呈现的对称会在右半球产生对侧 SPN，反之亦然。本研究探讨了空间注意力焦点是否会调节对侧 SPN。在每次试验中，有两个点模式，一个在注视点的左侧，一个在注视点的右侧。一个中央箭头提示指向其中一个模式，参与者对其规则性（对称或随机）进行辨别。我们比较了在注意和未注意空间位置产生的对称的对侧 SPN 幅度。虽然对注意到的对称的反应略有增强，但对未注意到的对称的反应仍然很大。尽管视觉对称检测是一个计算上的挑战，但我们得出结论，大脑会处理视觉场中未注意到的部分的视觉对称。
