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昆虫大脑中央复合体内的神经活动与运动变化有关。

Neural activity in the central complex of the insect brain is linked to locomotor changes.

机构信息

Department of Biology, Case Western Reserve University, Cleveland, OH 44106-7080, USA.

出版信息

Curr Biol. 2010 May 25;20(10):921-6. doi: 10.1016/j.cub.2010.03.054. Epub 2010 May 6.

Abstract

Animals negotiating complex natural terrain must consider cues around them and alter movement parameters accordingly. In the arthropod brain, the central complex (CC) receives bilateral sensory relays and sits immediately upstream of premotor areas, suggesting that it may be involved in the context-dependent control of behavior. In previous studies, CC neurons in various insects responded to visual, chemical, and mechanical stimuli, and genetic or physical lesions affected locomotor behaviors. Additionally, electrical stimulation of the CC led to malformed chirping movements by crickets, and pharmacological stimulation evoked stridulation in grasshoppers, but no more precise relationship has been documented between neural activity in the CC and movements in a behaving animal. We performed tetrode recordings from the CC of cockroaches walking in place on a slippery surface. Neural activity in the CC was strongly correlated with, and in some cases predictive of, stepping frequency. Electrical stimulation of these areas also evoked or modified walking. Many of the same neural units responded to tactile antennal stimulation while the animal was standing still but became unresponsive during walking. Therefore, these CC units are unlikely to be reporting only sensory signals, but their activity may be directing changes in locomotion based on sensory inputs.

摘要

动物在穿越复杂的自然地形时,必须考虑周围的线索,并相应地改变运动参数。在节肢动物的大脑中,中央复合体(CC)接收双侧感觉中继,并位于运动前区域的直接上游,这表明它可能参与了行为的上下文相关控制。在以前的研究中,各种昆虫的 CC 神经元对视觉、化学和机械刺激做出反应,遗传或物理损伤会影响运动行为。此外,对 CC 的电刺激导致蟋蟀发出畸形的鸣叫声,对草蜢的药理学刺激引起其摩擦发声,但在 CC 中的神经活动与行为动物的运动之间,尚未记录到更精确的关系。我们在蟑螂在光滑表面上原地行走时,从 CC 进行了四极管记录。CC 中的神经活动与步频强烈相关,在某些情况下还可以预测步频。对这些区域的电刺激也会引发或改变行走。当动物静止不动时,许多相同的神经单元会对触须的触角刺激做出反应,但在行走时却没有反应。因此,这些 CC 单元不太可能仅报告感觉信号,但其活动可能根据感觉输入来指导运动的变化。

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