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Orientation-dependency of perceptual surround suppression and orientation decoding of centre-surround stimuli are preserved with healthy ageing.
Vision Research ( IF 1.8 ) Pub Date : 2020-08-15 , DOI: 10.1016/j.visres.2020.07.015
Bao N Nguyen 1 , Yu Man Chan 1 , Stefan Bode 2 , Allison M McKendrick 1
Affiliation  

A key visual neuronal property that is mirrored in human behaviour is centre-surround contrast suppression, which is orientation-dependent. When a target is embedded in a high-contrast surround, the centre appears reduced in contrast, the magnitude of which depends on the relative orientation between centre and surround. Previous reports demonstrate changes in perceptual surround suppression with ageing; however, whether the orientation-dependency of surround suppression is impacted by ageing has not been explored. Here, we tested 18 younger (aged 19–33) and 18 older (aged 60–77) adults. Perceptual surround suppression was stronger for parallel than orthogonal stimuli; however contrary to previous work, here we found no difference in perceptual suppression strength between age-groups. In the same participants, we measured event-related potentials (ERPs) and conducted multivariate pattern analysis to confirm that parallel and orthogonal centre-surround stimuli elicit distinguishable brain activity, predominantly over occipital areas. Despite a delay in the first prominent ERP component (P1) in response to each pattern, older adults showed similar decoding of orientation information (i.e. distinguish between parallel and orthogonal centre-surround stimuli from 70 ms post-stimulus onset) as younger adults. This suggests that sufficient information to distinguish orientation in centre-surround stimuli becomes available to the older human brain as early as in younger adults.



中文翻译:

感知环绕抑制的方向依赖性和中心环绕刺激的方向解码随着健康老龄化得以保留。

反映在人类行为中的一个关键视觉神经元特性是中心环绕对比度抑制,它与方向相关。当目标嵌入高对比度环绕中时,中心看起来对比度降低,其大小取决于中心和环绕之间的相对方向。以前的报告表明,随着年龄的增长,感知周围抑制的变化;然而,环绕声抑制的方向依赖性是否受老化的影响尚未被探索。在这里,我们测试了 18 名年轻人(19-33 岁)和 18 名老年人(60-77 岁)。平行刺激的感知环绕抑制比正交刺激更强;然而,与之前的工作相反,在这里我们发现年龄组之间的知觉抑制强度没有差异。在相同的参与者中,我们测量了事件相关电位 (ERP) 并进行了多变量模式分析,以确认平行和正交的中心周围刺激引起可区分的大脑活动,主要是在枕骨区域。尽管响应每个模式的第一个突出的 ERP 组件 (P1) 延迟,但老年人显示出与年轻人类似的方向信息解码(即区分平行和正交的中心环绕刺激从刺激后 70 毫秒开始)。这表明,早在年轻人中,老年人大脑就可以获得足够的信息来区分中心周围刺激中的方向。主要在枕部区域。尽管响应每个模式的第一个突出的 ERP 组件 (P1) 延迟,但老年人显示出与年轻人类似的方向信息解码(即区分平行和正交的中心环绕刺激从刺激后 70 毫秒开始)。这表明,早在年轻人中,老年人大脑就可以获得足够的信息来区分中心周围刺激中的方向。主要在枕部区域。尽管响应每个模式的第一个突出的 ERP 组件 (P1) 延迟,但老年人显示出与年轻人类似的方向信息解码(即区分平行和正交的中心环绕刺激从刺激后 70 毫秒开始)。这表明,早在年轻人中,老年人大脑就可以获得足够的信息来区分中心周围刺激中的方向。

更新日期:2020-08-15
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