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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Amygdala regulates risk of predation in rats foraging in a dynamic fear environment
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Amygdala regulates risk of predation in rats foraging in a dynamic fear environment

机译：杏仁核调节在动态恐惧环境中觅食的老鼠的捕食风险

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摘要

In a natural environment, foragers constantly face the risk of encountering predators. Fear is a defensive mechanism evolved to protect animals from danger by balancing the animals' needs for primary resources with the risk of predation, and the amygdala is implicated in mediating fear responses. However, the functions of fear and amygdala in foraging behavior are not well characterized because of the technical difficulty in quantifying prey-predator interaction with real (unpredictable) predators. Thus, the present study investigated the rat's foraging behavior in a seminaturalistic environment when confronted with a predator-like robot programmed to surge toward the animal seeking food. Rats initially fled into the nest and froze (demonstrating fear) and then cautiously approached and seized the food as a function of decreasing nest-food and increasing food-robot distances. The likelihood of procuring food increased and decreased via lesioning/inactivating and disinhibiting the amygdala, respectively. These results indicate that the amygdala bidirec-tionally regulates risk behavior in rats foraging in a dynamic fear environment.
机译：在自然环境中，觅食者不断面临与食肉动物相遇的风险。恐惧是一种防御机制，旨在通过平衡动物对主要资源的需求与掠食的风险来保护动物免受威胁，而扁桃体参与调解恐惧反应。然而，恐惧和杏仁核在觅食行为中的功能并没有得到很好的表征，这是因为定量量化猎物与食肉动物与真实（不可预测）食肉动物的相互作用的技术难度。因此，本研究调查了这种老鼠在半自然环境中的觅食行为，该老鼠面对的是掠食性机器人，该机器人被编程为向寻找食物的动物冲动。老鼠起初逃入巢穴并冻结（表明恐惧），然后谨慎地接近并抓住食物，这是减少巢穴食物和增加食物与机器人距离的作用。通过破坏/灭活和抑制杏仁核，获得食物的可能性分别增加和减少。这些结果表明杏仁核可双向调节在动态恐惧环境中觅食的大鼠的危险行为。

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