论文部分内容阅读
目的许多研究显示,当一个靠近的物体在视网膜的成像达到一定阈值时,动物即表现出逃避行为。本研究旨在探讨青蛙的这种复杂的神经活动机理。方法用计算机模拟不同类型的视觉刺激,并用多电极和单电极记录方法来记录碰撞刺激引起的视顶盖细胞的神经活动。结果多电极记录显示视顶盖神经细胞对碰撞刺激的反应具有选择性,且反应特性相似于蝗虫的小叶大运动侦察器神经元(lobula giant-movement detector,LGMD)和鸽子的η碰撞神经细胞。但与这些细胞相比,视顶盖神经细胞受容野的大小相对较小。单电极记录研究了这些碰撞敏感细胞的视觉参数。其视觉参数l/v和即将碰撞时间(time-to-collision)之间存在线性关系。结论这些结果进一步证实了青蛙视顶盖的碰撞敏感细胞的神经活性与一定的视网膜成像大小有关,有助于进一步阐明青蛙逃避行为的内在机制。
Purpose Many studies have shown that animals exhibit evasion behavior when the retina is imaged by a nearby object to a certain threshold. This study aims to investigate the complex mechanism of neural activity in frogs. Methods Different types of visual stimuli were simulated by computer, and the neuronal activity of visual cortex cells caused by collision stimulation was recorded by multi-electrode and single-electrode recording methods. Results Multi-electrode recordings showed that the neurons in the visual cortex were selective for response to collision stimuli and their response characteristics were similar to those of the lobula giant-movement detector (LGMD) locust and the η collision neurons in pigeons. However, compared with these cells, the size of the optic nerve cells in the visual cortex is relatively small. Single electrode recording studied the visual parameters of these collision-sensitive cells. There is a linear relationship between the visual parameter l / v and the time-to-collision. Conclusions These results further confirm that the neuronal activity of the collision-sensitive cells of the frog canopy is related to the size of the retinal imaging and help to further elucidate the intrinsic mechanism of frog escape behavior.