Inter-area correlations in the ventral visual pathway reflect feature integration.
Inter-area correlations in the ventral visual pathway reflect feature integration.
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DOI：
10.1167/11.4.15
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发表时间：
2011-04-26
影响因子：
1.8
通讯作者：
Heeger DJ
中科院分区：
文献类型：
--
作者：
Freeman J;Donner TH;Heeger DJ
在物体感知过程中，大脑将简单的特征整合到复杂物体的表征中。一种被称为视觉拥挤的感知现象选择性地干扰了这一过程。在这里，我们使用拥挤来表征特征整合的神经相关性。皮质活动的功能磁共振成像测量，同时在多个领域的腹侧视觉通路（V1-V4和视觉词形区，VWFA，优先响应熟悉的字母），而人类受试者看到拥挤和不拥挤的字母。拥挤的字母比不拥挤的字母，尤其是V1和VWFA之间的皮层区域之间的时间相关性较低。这些相关性的差异是视网膜特异性的，当注意力从字母上转移时，这些差异仍然存在。但是，当我们用在我们的刺激条件下不拥挤的光栅贴片代替字母时，相关性差异并不明显。我们的结论是，区域间的相关性反映了功能集成和拥挤被打乱。我们认为，拥挤可能会扰乱神经表征之间的转换沿着腹侧通路的基础上整合到对象的功能。
During object perception, the brain integrates simple features into representations of complex objects. A perceptual phenomenon known as visual crowding selectively interferes with this process. Here, we use crowding to characterize a neural correlate of feature integration. Cortical activity was measured with functional magnetic resonance imaging, simultaneously in multiple areas of the ventral visual pathway (V1–V4 and the visual word form area, VWFA, which responds preferentially to familiar letters), while human subjects viewed crowded and uncrowded letters. Temporal correlations between cortical areas were lower for crowded letters than for uncrowded letters, especially between V1 and VWFA. These differences in correlation were retinotopically specific, and persisted when attention was diverted from the letters. But correlation differences were not evident when we substituted the letters with grating patches that were not crowded under our stimulus conditions. We conclude that inter-area correlations reflect feature integration and are disrupted by crowding. We propose that crowding may perturb the transformations between neural representations along the ventral pathway that underlie the integration of features into objects.
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通讯作者：
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