Analysis and Synthesis of Natural Texture Perception From Visual Evoked Potentials.
Analysis and Synthesis of Natural Texture Perception From Visual Evoked Potentials.
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DOI：
10.3389/fnins.2021.698940
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发表时间：
2021
影响因子：
4.3
通讯作者：
Motoyoshi I
中科院分区：
文献类型：
--
作者：
Orima T;Motoyoshi I
灵长类视觉系统分析自然图像中的统计信息，并将其用于对场景，物体和表面材料的即时感知。为了研究人脑中图像统计的动态编码，我们测量了166个自然纹理及其合成版本的视觉诱发电位（VEP），并对VEP和图像的代表性纹理统计进行了反向相关分析。分析显示枕叶VEP成分与特定纹理统计密切相关。VEP与低级别的统计，如子带SD，迅速出现在100至250毫秒的空间频率依赖的方式。VEP与高阶统计相关，如子带峰度和跨带相关性，在稍晚的时候观察到。此外，这些强大的相关性使我们能够通过线性回归从VEP信号中逆估计纹理统计，并重建与原始统计合成的纹理图像相似的纹理图像。此外，我们发现在200-300毫秒的VEP显着差异之间的一些自然纹理和他们的Portilla-Simoncelli（PS）合成的版本，即使他们共享几乎相同的纹理统计。这种差异VEP与PS合成纹理的感知“不自然”有关。这些结果表明，视觉皮层快速编码图像统计隐藏在自然纹理具体到足以预测纹理的视觉外观，而它也代表了高层次的信息超出图像统计，脑电图可以用来解码这些皮质信号。
The primate visual system analyzes statistical information in natural images and uses it for the immediate perception of scenes, objects, and surface materials. To investigate the dynamical encoding of image statistics in the human brain, we measured visual evoked potentials (VEPs) for 166 natural textures and their synthetic versions, and performed a reverse-correlation analysis of the VEPs and representative texture statistics of the image. The analysis revealed occipital VEP components strongly correlated with particular texture statistics. VEPs correlated with low-level statistics, such as subband SDs, emerged rapidly from 100 to 250 ms in a spatial frequency dependent manner. VEPs correlated with higher-order statistics, such as subband kurtosis and cross-band correlations, were observed at slightly later times. Moreover, these robust correlations enabled us to inversely estimate texture statistics from VEP signals via linear regression and to reconstruct texture images that appear similar to those synthesized with the original statistics. Additionally, we found significant differences in VEPs at 200–300 ms between some natural textures and their Portilla–Simoncelli (PS) synthesized versions, even though they shared almost identical texture statistics. This differential VEP was related to the perceptual “unnaturalness” of PS-synthesized textures. These results suggest that the visual cortex rapidly encodes image statistics hidden in natural textures specifically enough to predict the visual appearance of a texture, while it also represents high-level information beyond image statistics, and that electroencephalography can be used to decode these cortical signals.
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