Release from Cross-Orientation Suppression Facilitates 3D Shape Perception
Release from Cross-Orientation Suppression Facilitates 3D Shape Perception
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DOI：
10.1371/journal.pone.0008333
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发表时间：
2009-12-16
期刊：
影响因子：
3.7
通讯作者：
Zaidi, Qasim
中科院分区：
文献类型：
--
作者：
Li, Andrea;Zaidi, Qasim
纹状皮质的交叉定向抑制(COS)与视觉刺激的有效编码有关。我们表明，COS的释放有助于3D形状的解码。在覆盖有纹理的平面中，倾斜曲面可以增加平行于倾斜的零部件的可见性。由于该组件提供表示3-D形状的定向流，因此可见性的增强有助于3-D倾斜感知。对比度阈值显示，当3-D倾斜导致纹理分量之间的频率不匹配时，这种增强是由于COS的减少造成的。我们发现，LGN神经元中的压缩非线性与皮质神经元中的扩展非线性耦合可以模拟特定频率的抑制成分。
Cross-orientation suppression (COS) in striate cortex has been implicated in the efficient encoding of visual stimuli. We show that release from COS facilitates the decoding of 3-D shape. In planar surfaces overlaid with textures, slanting the surface can increase the visibility of the component parallel to the slant. Since this component provides the orientation flows that signify 3-D shape, the enhancement of visibility facilitates 3-D slant perception. Contrast thresholds reveal that this enhancement results from a decrease in COS when 3-D slant creates a frequency mismatch between texture components. We show that coupling compressive nonlinearities in LGN neurons with expansive nonlinearities in cortical neurons can model the frequency-specific component of suppression.