Perceptual integration for qualitatively different 3-D cues in the human brain.
Perceptual integration for qualitatively different 3-D cues in the human brain.
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DOI：
10.1162/jocn_a_00417
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发表时间：
2013-09
影响因子：
3.2
通讯作者：
Welchman AE
中科院分区：
文献类型：
--
作者：
Dövencioğlu D;Ban H;Schofield AJ;Welchman AE
视觉系统在估计深度方面的灵活性是显着的：我们很容易在不同的条件下感知三维（3D）结构，从“魔眼”立体图看似随机的点到古代大师的美学上美丽但明显平坦的画布。然而，当不同的线索指定相同的深度时，3D 感知通常会增强。这种感知过程被理解为改善感官估计的贝叶斯推理。尽管这一理论得到了相当多的行为支持，但对所涉及的皮质回路的了解仍然有限。此外，现有的工作测试了定量相似的线索，减少了与整合计算和定性不同信号相关的一些挑战。在这里，我们通过测量功能性 MRI 对由阴影、双眼视差及其组合定义的深度结构的响应来解决这一挑战。我们使用模式分类分析量化了不同视觉皮层区域的深度配置（凸的“凸起”与凹的“酒窝”）的信息。我们发现，当视差和阴影同时表示深度时，背侧视觉区域 V3B/KO 的 fMRI 反应更具可辨别性，这与线索整合的预测一致。重要的是，通过将功能磁共振成像和心理物理学整合测试联系起来，我们观察到深度判断和该领域活动之间的密切联系。最后，使用跨线索转移测试，我们发现一个线索引起的功能磁共振成像反应可以对另一个线索引起的反应进行分类。这揭示了背侧视觉皮层的广义深度表示，它结合了符合 3D 感知的定性不同信息。
The visual system’s flexibility in estimating depth is remarkable: we readily perceive three-dimensional (3D) structure under diverse conditions from the seemingly random dots of a ‘magic eye’ stereogram to the aesthetically beautiful, but obviously flat, canvasses of the Old Masters. Yet, 3D perception is often enhanced when different cues specify the same depth. This perceptual process is understood as Bayesian inference that improves sensory estimates. Despite considerable behavioral support for this theory, insights into the cortical circuits involved are limited. Moreover, extant work tested quantitatively similar cues, reducing some of the challenges associated with integrating computationally and qualitatively different signals. Here we address this challenge by measuring functional MRI responses to depth structures defined by shading, binocular disparity and their combination. We quantified information about depth configurations (convex ‘bumps’ vs. concave ‘dimples’) in different visual cortical areas using pattern-classification analysis. We found that fMRI responses in dorsal visual area V3B/KO were more discriminable when disparity and shading concurrently signaled depth, in line with the predictions of cue integration. Importantly, by relating fMRI and psychophysical tests of integration, we observed a close association between depth judgments and activity in this area. Finally, using a cross-cue transfer test, we found that fMRI responses evoked by one cue afford classification of responses evoked by the other. This reveals a generalized depth representation in dorsal visual cortex that combines qualitatively different information in line with 3D perception.
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影响因子：
19.5
作者：
Belhumeur, PN;Kriegman, DJ;Yuille, AL
通讯作者：
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影响因子：
64.8
作者：
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DOI：
10.1364/josaa.5.001749
发表时间：
1988-10-01
影响因子：
1.9
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通讯作者：
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25
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作者：
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