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Robust judgement of inter-object distance by an arthropod

机译:节肢动物对物体间距离的可靠判断

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摘要

Animals use several strategies for depth vision, reflecting the constraints imposed by body size, the structure of the visual system and the visual geometry of the environment. Arthropods in particular have restricted depth perception, because they are small and possess closely set, low-resolution compound eyes. Yet, here we show that fiddler crabs defending their burrows from conspecifics can judge how close other crabs are to their burrow. When confronted with small dummy crabs, the burrow owners assess the dummy's position and motion relative to their burrow and not relative to themselves―in other words, by using an allocentric rather than an egocentric frame of reference. Irrespective of their own distance from the dummy, the likelihood that the crabs rush back to defend their burrow increases strongly as the dummy approaches the burrow. In addition, the mean dummy-burrow distance at which the crabs respond is constant and independent of the dummy's direction of approach. We propose that to solve this sophisticated task of relative distance judgement, the crabs combine visual information on dummy position and direction with information on burrow location acquired during path integration. In doing so, the crabs, like humans, make clever use of the visual geometry of their environment.
机译:动物使用多种深度视觉策略,以反映身体尺寸,视觉系统结构和环境视觉几何形状所施加的限制。节肢动物特别受深度感知的限制,因为它们很小,并且具有紧密固定的低分辨率复眼。然而,在这里我们表明,保护螃蟹不受特定物种侵害的提琴蟹可以判断其他螃蟹与它们的洞穴有多近。当面对小型假蟹时,洞穴主人会评估假人相对于其洞穴而不是相对于自己的位置和运动,换句话说,是使用同心轴而不是自我中心的参照系。不管它们自己与假人的距离如何,当假人接近洞穴时,螃蟹冲回以保卫其洞穴的可能性大大增加。此外,螃蟹反应的平均假人洞穴距离是恒定的,并且与假人的接近方向无关。我们提出,为了解决这一复杂的相对距离判断任务,螃蟹将虚拟位置和方向的视觉信息与路径整合过程中获得的洞穴位置信息相结合。这样,螃蟹就像人类一样,巧妙地利用了周围环境的视觉几何形状。

著录项

  • 来源
    《Nature》 |2003年第6919期|p.160-163|共4页
  • 作者

    Jan M. Hemmi; Jochen Zeil;

  • 作者单位

    Centre for Visual Sciences, Research School of Biological Sciences, Australian National University, PO Box 475, Canberra, Australian Capital Territory 2601 Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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