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首页> 外文期刊>Brain research >Looming responses of telencephalic neurons in the pigeon are modulated by optic flow
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Looming responses of telencephalic neurons in the pigeon are modulated by optic flow

机译：光学流动调节鸽子中椎间型神经元的迫近响应

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The movement of animals through space filled with various objects requires the interaction between neuronal mechanisms specialized for processing local object motion and those specialized for processing optic flow generated by self-motion of the animal. In the avian brain, visual nuclei in the tectofugal pathway are primarily involved in the detection of object motion. By contrast, the nucleus of the basal optic root (nBOR) and the pretectal nucleus lentiformis mesencephali (nLM) are dedicated to the analysis of optic flow. But little is known about how these two systems interact. Using single-unit recording in the entopallium of the tectofugal pathway, we show that some neurons appeared to be integrating visual information of looming objects and whole-field motion simulating optic flow. They specifically responded to looming objects, but their looming responses were modulated by optic flow. Optic flow in the nasotemporal direction, typically produced by the forward movement of the bird, only mildly inhibited the looming responses. Furthermore, these neurons started firinglaterthan when the looming object was presented against a stationary background. However, optic flow in other directions, especially the temporonasal direction, strongly inhibited their looming responses. Previous studies have implicated looming-sensitive neurons in predator avoidance behavior and these results suggest that a bird in motion may need less time to initiate an avoidance response to an approaching object.
机译：动物通过填充有各种目的的空间的运动需要专门用于处理局部对象运动的神经元机制之间的相互作用，以及专门用于通过动物自动运动产生的光学流的那些。在禽脑中，构造途径中的视觉核主要参与了对象运动的检测。相比之下，基底光学根（NBOR）和防范核亮度效应（NLM）的核心专用于光学流动的分析。但对于这两个系统如何互动而言，很少。在构造路径的占球群体中使用单单元录制，我们表明一些神经元似乎是集成了覆盖物体的视觉信息和全场运动模拟光学流。他们专门响应了迫在眉睫的物体，但是通过光学流量调节它们的迫在眉睫的反应。光学流动在鼻腔方向上，通常由鸟的前向运动产生，只有轻度抑制迫近的响应。此外，当迫在眉睫的物体呈现静止背景时，这些神经元开始发射拉特坦。然而，光学流动在其他方向，特别是临时方向，强烈抑制了它们的迫近反应。以前的研究在捕食性行为中具有含有含有的雷米敏感的神经元，并且这些结果表明运动中的鸟类可能需要更少的时间来启动对接近对象的避免响应。

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