DEEP TECTAL CELLS IN PIGEONS RESPOND TO KINEMATOGRAMS
DEEP TECTAL CELLS IN PIGEONS RESPOND TO KINEMATOGRAMS
复制标题
DOI：
10.1007/bf01342639
复制
发表时间：
1988-01-01
影响因子：
2.1
通讯作者：
MORGAN, B
中科院分区：
文献类型：
--
作者：
FROST, BJ;CAVANAGH, P;MORGAN, B
鸽子顶盖深层神经元对运动视觉刺激有选择性反应，并被与这些刺激同相运动的大背景模式所抑制。在这项调查中，我们表明，这些相同的深顶盖神经元同样很好地响应运动图，因为他们做传统的亮度对比度刺激通常采用的视觉实验。计算机生成的运动图，随机点立体图的运动域等效物，被用作这些实验中的刺激。这些运动图，其中一个小的位于中心的一组随机点在一个方向上连贯地移动，而其余的点在不同的方向上移动，因此构成了纯运动刺激，其中刺激形式仅在动态图案中可见，但不存在于任何单个帧上。“对象”配置和“孔”配置的运动图都被采用;前者表现为在背景纹理前面移动的纹理区域，而后者表现为窗口，通过该窗口可以显示更远的纹理表面。从孤立的深层顶盖细胞的细胞外记录表明，所有单位的反应非常相似的方式，无论是刺激是一个“对象”配置的运动图或更传统的亮度对比度品种。这种相似性包括方向选择性，同相抑制反相促进效应，以及对独立于方向的相反运动的敏感性。然而，当运动图被配置为“孔”时，没有一个测试单元对这些刺激做出反应。这些意见的意义顶盖功能，通过运动和动物伪装的图像分割进行了讨论。
Deep tectal neurons in pigeons respond selectively to moving visual stimuli, and are inhibited by large background patterns move in-phase with these stimuli. In this investigation we demonstrate that these same deep tectal neurons respond equally well to kinematograms as they do to traditional luminance contrast stimuli typically employed in visual experiments. Computer generated kinematograms, the motion domain equivalents of random dot stereograms, were used as stimuli in these experiments. These kinematograms, where a small centrally located set of random dots is moved coherently in one direction while the remaining dots are moved in a different direction, thus constitute a pure motion stimulus where the stimulus form is only visible in the dynamic pattern, but does not exist on any single frame. Both ''object'' configured and ''hole'' configured kinematograms were employed; the former appearing as regions of texture moving over, in front of, the background texture, while the latter appear as windows through which a more distant textured surface is revealed. Extracellular recordings from isolated deep tectal cells showed that all units responded in a very similar manner whether the stimulus was an ''object'' configured kinematogram or the more traditional luminance contrast variety. This similarity included directional selectivity, the in-phase inhibition anti-phase facilitation effect, and sensitivity to opposed motion independent of direction. However, when the kinematograms were configured as ''holes'' none of the units tested responded to these stimuli. The significance of these observations for tectal functioning, image segmentation through motion and animal camouflage is discussed.