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首页> 外文期刊>The European Journal of Neuroscience >Drifting grating stimulation reveals particular activation properties of visual neurons in the caudate nucleus.
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Drifting grating stimulation reveals particular activation properties of visual neurons in the caudate nucleus.

机译：漂移光栅刺激揭示了尾状核中视觉神经元的特定激活特性。

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The role of the caudate nucleus (CN) in motor control has been widely studied. Less attention has been paid to the dynamics of visual feedback in motor actions, which is a relevant function of the basal ganglia during the control of eye and body movements. We therefore set out to analyse the visual information processing of neurons in the feline CN. Extracellular single-unit recordings were performed in the CN, where the neuronal responses to drifting gratings of various spatial and temporal frequencies were recorded. The responses of the CN neurons were modulated by the temporal frequency of the grating. The CN units responded optimally to gratings of low spatial frequencies and exhibited low spatial resolution and fine spatial frequency tuning. By contrast, the CN neurons preferred high temporal frequencies, and exhibited high temporal resolution and fine temporal frequency tuning. The spatial and temporal visual properties of the CN neurons enable them to act as spatiotemporal filters. These properties are similar to those observed in certain feline extrageniculate visual structures, i.e. in the superior colliculus, the suprageniculate nucleus and the anterior ectosylvian cortex, but differ strongly from those of the primary visual cortex and the lateral geniculate nucleus. Accordingly, our results suggest a functional relationship of the CN to the extrageniculate tecto-thalamo-cortical system. This system of the mammalian brain may be involved in motion detection, especially in velocity analysis of moving objects, facilitating the detection of changes during the animal's movement.
机译：尾状核（CN）在运动控制中的作用已被广泛研究。较少关注运动动作中视觉反馈的动力学，这是控制眼球和身体运动过程中基底神经节的一个相关功能。因此，我们着手分析猫CN中神经元的视觉信息处理。在CN中进行细胞外单单位记录，在该处记录了对各种时空频率的漂移光栅的神经元反应。 CN神经元的响应受光栅的时间频率调制。 CN单元对低空间频率的光栅具有最佳响应，并表现出低空间分辨率和精细的空间频率调谐。相比之下，CN神经元更喜欢高时间频率，并表现出高时间分辨率和精细的时间频率调谐。 CN神经元的时空视觉特性使其能够充当时空过滤器。这些性质类似于在某些猫的外膝部视觉结构中观察到的性质，即在上丘，上膝部核和前外侧胞外皮层中观察到的那些，但是与初级视觉皮层和外侧膝部核有很大不同。因此，我们的研究结果表明CN与外生型tecto-thalamo-皮层系统的功能关系。哺乳动物大脑的这个系统可能参与运动检测，尤其是运动对象的速度分析，从而有助于检测动物运动过程中的变化。

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