McGill Vision Research, Department of Ophthalmology, McGill University, Montreal, Quebec, Canada.
Sci Rep. 2019 Feb 7;9(1):1637. doi: 10.1038/s41598-018-37631-2.
Previous studies have shown that texture regularity is adaptable, and have suggested that texture regularity might be coded by the peakedness of the underlying spatial frequency distribution. Here we demonstrate the related phenomenon of simultaneous regularity contrast (SRC), in which the perceived regularity of a central texture is influenced by the regularity of a surrounding texture. We presented center-surround arrangements of textures and measured the perceived regularity of the centre, using a centre-only comparison stimulus and a 2AFC procedure. From the resulting psychometric functions the SRC was measured as the difference between test and comparison regularity at the PSE (point of subjective equality). Observers generally exhibited asymmetric bidirectional SRC, in that more regular surrounds decreased the perceived regularity of the centre by between 20-40%, while less regular surrounds increased the perceived regularity of the centre by about 10%. Consistent with previous studies, a wavelet spatial frequency (SF) analysis of the stimuli revealed that their SF distributions became sharper with increased regularity, and therefore that distribution statistics such as kurtosis and SF bandwidth might be used to code regularity.
先前的研究表明，纹理规则性是可适应的，并且表明纹理规则性可能由基础空间频率分布的峰度来编码。在这里，我们展示了相关的同时规则对比（SRC）现象，其中中心纹理的感知规则性受到周围纹理规则性的影响。我们呈现了纹理的中心-环绕排列，并使用仅中心比较刺激和 2AFC 程序测量了中心的感知规则性。从得出的心理物理函数中，以 PSE（主观均等点）处的测试和比较规则之间的差异来测量 SRC（同时规则对比）。观察者通常表现出不对称的双向 SRC，即更规则的环绕使中心的感知规则性降低了 20-40%，而较不规则的环绕则使中心的感知规则性提高了约 10%。与先前的研究一致，对刺激的小波空间频率（SF）分析表明，它们的 SF 分布随着规则性的增加而变得更加陡峭，因此，分布统计数据（如峰度和 SF 带宽）可能用于编码规则性。
