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首页> 外文期刊>The European Journal of Neuroscience >Neurons in monkey visual cortex detect lines defined by coherent motion of dots.
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Neurons in monkey visual cortex detect lines defined by coherent motion of dots.

机译：猴子视觉皮层中的神经元检测由点的连贯运动定义的线。

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摘要

Form perception from coherent motion is an important aspect of vision. Representations of one-, two- and three-dimensional forms have been found at various stages of cortical processing using random-dot stimuli, whereas representations of biological objects like a walking human being concentrate at higher stages of processing. The perception of biological objects can be induced by sparse dot stimuli that consist of a few dots that mark the joints of the human body [G. Johansson (1973) Percept. Psychophys., 14, 201-211]. In the present study, we aimed to investigate whether neurons in early visual areas that respond to bars and edges defined by luminance contrast also signal bar-like objects from sparse dot stimuli. We studied single neurons with rows of 3-24 dots that were either collinear or scattered within a rectangular form. These dots were moved coherently on a uniform or dotted background, and human observers perceived them as rigid rods or other bar-like objects. We found neurons in the visual cortex of the awake, behaving monkey that responded to these stimuli and were sensitive to the orientation of these objects as for conventional bars or edges. Stimulus conditions that failed to induce these percepts in human observers also evoked weaker responses or none in these neurons. We found these neurons with increasing frequency in areas V1, V2 and V3/V3A. The results suggest that the visual cortex not only detects biological objects, but also lines and other bar-like objects from sparse dot stimuli, and that this function evolves at an early stage of processing.
机译：来自连贯运动的形式感知是视觉的重要方面。一维，二维和三维形式的表示已在使用随机点刺激的皮质处理的各个阶段中找到，而诸如步行者之类的生物对象的表示则集中在处理的更高阶段。稀疏的点刺激可以诱导生物对象的感知，稀疏的点刺激由标记人体关节的几个点组成[G. Johansson（1973）感知。 （《心理学》，第14卷，第201-211页）。在本研究中，我们旨在调查早期视觉区域中对亮度对比度所定义的条和边做出响应的神经元是否也从稀疏点刺激信号出条状对象。我们研究了具有3-24个点的行的单个神经元，这些行共线或散布在矩形中。这些点在均匀或点状的背景下连贯地移动，人类观察者将它们视为刚性杆或其他条状物体。我们在醒着的视觉皮层中发现了神经元，表现出对这些刺激做出反应的猴子，并且对这些对象的方向很敏感，就像常规的条或边一样。未能在人类观察者中诱发这些感觉的刺激条件也引起这些神经元反应较弱或没有反应。我们发现这些神经元在区域V1，V2和V3 / V3A中的频率增加。结果表明，视觉皮层不仅可以检测生物对象，还可以检测稀疏点刺激产生的线条和其他类似条的对象，并且该功能在处理的早期阶段就得到了发展。

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