Contour junctions underlie neural representations of scene categories in high-level human visual cortex
Contour junctions underlie neural representations of scene categories in high-level human visual cortex
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DOI：
10.1016/j.neuroimage.2016.04.021
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发表时间：
2016-07-15
期刊：
影响因子：
5.7
通讯作者：
Walther, Dirk B.
中科院分区：
文献类型：
--
作者：
Choo, Heeyoung;Walther, Dirk B.
人类有效地把握复杂的视觉环境，使入门级类别的高度一致的判断，尽管他们的视觉外观的高度变化。人类大脑是如何达到对现实世界环境进行分类的不变神经表征的？我们在这里表明，在场景选择性的人类视觉皮层的视觉环境的神经表示依赖于轮廓交界处的统计数据，这提供了线索的三维排列的表面在一个场景中。我们操纵了真实世界环境的线条图，使得轮廓方向或连接点的统计数据被打乱。在功能磁共振成像实验中，研究人员向参与者展示了经过处理的完整线条图。场景类别是从海马旁位置区（PPA），枕叶位置区（OPA）和其他视觉脑区的神经活动模式解码的。中断路口，但没有方向导致解码准确性急剧下降的PPA和OPA，表明这些地区的依赖完整的交界处的统计数据。另一方面，早期视觉皮层解码的准确性不受任何图像处理的影响。我们进一步表明，从场景选择性的大脑区域和行为实验解码之间的错误模式的相关性是偶然的完整的轮廓连接。最后，探照灯分析揭示了依赖视觉活跃的大脑区域的不同的轮廓属性。轮廓长度和曲率的统计数据在早期视觉区域和高水平场景选择性大脑区域的轮廓交界处的场景类别的神经表征中占主导地位。(C)2016 Elsevier Inc. All rights reserved.
Humans efficiently grasp complex visual environments, making highly consistent judgments of entry-level category despite their high variability in visual appearance. How does the human brain arrive at the invariant neural representations underlying categorization of real-world environments? We here show that the neural representation of visual environments in scene-selective human visual cortex relies on statistics of contour junctions, which provide cues for the three-dimensional arrangement of surfaces in a scene. We manipulated line drawings of real-world environments such that statistics of contour orientations or junctions were disrupted. Manipulated and intact line drawings were presented to participants in an fMRI experiment. Scene categories were decoded from neural activity patterns in the parahippocampal place area (PPA), the occipital place area (OPA) and other visual brain regions. Disruption of junctions but not orientations led to a drastic decrease in decoding accuracy in the PPA and OPA, indicating the reliance of these areas on intact junction statistics. Accuracy of decoding from early visual cortex, on the other hand, was unaffected by either image manipulation. We further show that the correlation of error patterns between decoding from the scene-selective brain areas and behavioral experiments is contingent on intact contour junctions. Finally, a searchlight analysis exposes the reliance of visually active brain regions on different sets of contour properties. Statistics of contour length and curvature dominate neural representations of scene categories in early visual areas and contour junctions in high-level scene-selective brain regions. (C) 2016 Elsevier Inc. All rights reserved.