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首页> 外文期刊>The European Journal of Neuroscience >Congruent representation of visual and acoustic space in the superior colliculus of the echolocating bat Phyllostomus discolor
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Congruent representation of visual and acoustic space in the superior colliculus of the echolocating bat Phyllostomus discolor

机译：在回声定位蝙蝠毛变色的上丘中视觉和听觉空间的一致表示

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The midbrain superior colliculus (SC) commonly features a retinotopic representation of visual space in its superficial layers, which is congruent with maps formed by multisensory neurons and motor neurons in its deep layers. Information flow between layers is suggested to enable the SC to mediate goal-directed orienting movements. While most mammals strongly rely on vision for orienting, some species such as echolocating bats have developed alternative strategies, which raises the question how sensory maps are organized in these animals. We probed the visual system of the echolocating bat Phyllostomus discolor and found that binocular high acuity vision is frontally oriented and thus aligned with the biosonar system, whereas monocular visual fields cover a large area of peripheral space. For the first time in echolocating bats, we could show that in contrast with other mammals, visual processing is restricted to the superficial layers of the SC. The topographic representation of visual space, however, followed the general mammalian pattern. In addition, we found a clear topographic representation of sound azimuth in the deeper collicular layers, which was congruent with the superficial visual space map and with a previously documented map of orienting movements. Especially for bats navigating at high speed in densely structured environments, it is vitally important to transfer and coordinate spatial information between sensors and motor systems. Here, we demonstrate first evidence for the existence of congruent maps of sensory space in the bat SC that might serve to generate a unified representation of the environment to guide motor actions.
机译：中脑上丘（SC）通常在其表层具有视空间的视网膜代表，这与在其深层由多感觉神经元和运动神经元形成的图一致。建议在各层之间进行信息流动，以使SC能够协调目标导向的定向运动。尽管大多数哺乳动物强烈依赖视觉进行定向，但某些物种（如回声蝙蝠）已经开发出替代策略，这提出了如何在这些动物中组织感觉图的问题。我们探究了回声蝙蝠毛竹变色的视觉系统，发现双眼高敏视力是正面定向的，因此与生物声纳系统对准，而单眼视野则覆盖了大范围的外围空间。第一次在回声蝙蝠中，我们可以证明与其他哺乳动物相比，视觉处理仅限于SC的表层。但是，视觉空间的地形图表示遵循一般的哺乳动物模式。此外，我们在较深的胶体层中发现了清晰的声音方位角地形图，这与浅层视觉空间图和以前记录的定向运动图一致。特别是对于在结构密集的环境中高速导航的蝙蝠，在传感器和电机系统之间传递和协调空间信息至关重要。在这里，我们证明蝙蝠SC中存在完整的感觉空间图，这可能有助于生成环境的统一表示以指导运动动作。

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