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Two stages of visual processing for radial and circular motion.

机译:径向和圆周运动的视觉处理分为两个阶段。

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摘要

As we move through our environment, the flow of the deforming images on our retinae provides rich information about ego motion and about the three-dimensional structure of the external world. Flow-fields comprise five independent components, including radial and circular motion. Here we provide psychophysical evidence for the existence of neural mechanisms in human vision that integrate motion signals along these complex trajectories. Signal-to-noise sensitivity for discriminating the direction of radial, circular and translational motion increased predictably with the number of exposed sectors, implying the existence of specialized detectors that integrate motion signals of different directions from different locations. However, contrast sensitivity for complex motion did not increase greatly with sector number, implying that the specialized detectors are preceded by a first stage of local-motion mechanisms that impose a contrast threshold. These findings fit well with recent electrophysiological evidence in monkey showing that whereas motion-sensitive neurons in primary visual cortex respond best to local translation, many neurons in the medial superior temporal cortex have large receptive fields tuned to radial, circular or spiral motion.
机译:当我们在环境中移动时,视网膜上变形图像的流动提供了有关自我运动和外部世界的三维结构的丰富信息。流场包括五个独立的分量,包括径向运动和圆周运动。在这里,我们提供了人类视觉中存在的神经机制的心理物理学证据,这些机制沿着这些复杂的轨迹整合了运动信号。可以分辨出径向,圆周和平移运动方向的信噪灵敏度随暴露扇区的数量而增加,这意味着存在专门的检测器,该检测器集成了来自不同位置的不同方向的运动信号。但是,复杂运动的对比敏感度并没有随扇区数的增加而大大增加,这意味着专用检测器之前是施加对比度阈值的局部运动机制的第一阶段。这些发现与最近的猴子电生理证据非常吻合,显示出虽然初级视觉皮层中的运动敏感神经元对局部翻译反应最好,但内侧颞上皮层中的许多神经元却具有适应于径向,圆周或螺旋运动的大接受力场。

著录项

  • 来源
    《Nature》 |1995年第6540期|P.507-509|共3页
  • 作者

    Morrone MC; Burr DC; Vaina LM;

  • 作者单位

    Istituto di Neurofisiologia del CNR, Pisa, Italy.;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

    Motion Perception; 运动知觉;

    机译:Motion Perception;运动知觉;

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