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纹状体外的轮廓、颜色和形状分析。

Contour, color and shape analysis beyond the striate cortex.

作者信息

Desimone R, Schein S J, Moran J, Ungerleider L G

出版信息

Vision Res. 1985;25(3):441-52. doi: 10.1016/0042-6989(85)90069-0.

Abstract

The corticocortical pathway from striate cortex into the temporal lobe plays a crucial role in the visual recognition of objects. Anatomical studies indicate that this pathway is mainly organized as a serial hierarchy of multiple visual areas, including V1, V2, V3, V4, and inferior temporal cortex (IT). As expected from the anatomy, we have found that neurons in V4 and IT, like those in V1 and V2, are sensitive to many kinds of information relevant to object recognition. In the spatial domain, many V4 cells exhibit length, width, orientation, direction of motion and spatial frequency selectivity. In the spectral domain, many V4 cells are also tuned to wavelength. Thus, V4 is not specialized to analyze one particular attribute of a visual stimulus; rather, V4 appears to process both spatial and spectral information in parallel. A special contribution of V4 neurons to visual processing may lie in specific spatial and spectral interactions between their small excitatory receptive fields and large silent suppressive surrounds. Thus, although the excitatory receptive fields of V4 neurons are small, the responses of V4 neurons are influenced by stimuli throughout a much larger portion of the visual field. In IT, neurons also appear to process both spatial and spectral information throughout a large portion of the visual field. However, unlike V4 neurons, the excitatory receptive fields of IT neurons are very large. Many IT neurons, for example, are selective for the overall shape, color, or texture of a stimulus, anywhere within the central visual field. Together, these results suggest that within the areas of the occipito-temporal pathway, many different stimulus qualities are processed in parallel, but the type of analysis may become more global at each stage of processing.

摘要

从纹状皮质到颞叶的皮质皮质通路在物体的视觉识别中起着至关重要的作用。解剖学研究表明,这条通路主要由多个视觉区域组成,呈串行层级结构,包括V1、V2、V3、V4和颞下皮质(IT)。正如解剖学所预期的那样,我们发现V4和IT中的神经元,与V1和V2中的神经元一样,对许多与物体识别相关的信息敏感。在空间领域,许多V4细胞表现出长度、宽度、方向、运动方向和空间频率选择性。在光谱领域,许多V4细胞也能对波长进行调谐。因此,V4并非专门用于分析视觉刺激的某一特定属性;相反,V4似乎能并行处理空间和光谱信息。V4神经元对视觉处理的特殊贡献可能在于其小的兴奋性感受野与大的静息抑制性周边之间的特定空间和光谱相互作用。因此,尽管V4神经元的兴奋性感受野很小,但其反应却受到整个视野中更大区域刺激的影响。在IT中,神经元似乎也能在整个视野的很大一部分区域内处理空间和光谱信息。然而,与V4神经元不同的是,IT神经元的兴奋性感受野非常大。例如,许多IT神经元对中央视野内任何位置的刺激的整体形状、颜色或纹理具有选择性。这些结果共同表明,在枕颞通路的区域内,许多不同的刺激特性是并行处理的,但在处理的每个阶段,分析类型可能会变得更加全局化。

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