Laming P R, Cairns C
School of Biology and Biochemistry, Queen's University of Belfast, Northern Ireland.
Behav Neurosci. 1998 Oct;112(5):1266-72.
Feeding in toads was tested by orient, approach, fixate, and snap responses to an artificial prey stimulus, before and at various times after feeding with natural prey (mealworms), or infusion of the gut with a prey-equivalent amount of glucose or volume of water. Feeding 5 prey objects or ad libitum feeding caused a decline in a prey catching when tested 2 hr later. Ingestion of 5 pulped mealworms or the equivalent glucose content and volume similarly decreased prey-catching, though an equal volume of water had no effect. Comparisons of the effect of time after glucose ingestion on prey-catching activity demonstrated that the major decline in activity occurred within 15 min, with no appreciable change after 2 hr. An equal volume of water had little effect on prey-catching activity over 15 min, but subsequent glucose ingestion reduced these behaviors. Thus, the decline in prey catching that occurs after feeding in toads can be rapidly replicated by ingestion of glucose, allowing future examination of the neural basis of satiety in these animals.
通过对人工猎物刺激的定向、接近、注视和捕捉反应，在给蟾蜍喂食天然猎物（黄粉虫）之前以及喂食后的不同时间，或向肠道注入等量葡萄糖或等量体积的水后，对蟾蜍的进食情况进行了测试。喂食5个猎物或随意喂食后，在2小时后进行测试时，捕捉猎物的能力会下降。摄入5只打成浆的黄粉虫或等量的葡萄糖含量和体积同样会降低捕捉猎物的能力，尽管等量的水没有影响。比较摄入葡萄糖后不同时间对捕捉猎物活动的影响表明，活动的主要下降发生在15分钟内，2小时后没有明显变化。等量的水在15分钟内对捕捉猎物的活动影响很小，但随后摄入葡萄糖会减少这些行为。因此，蟾蜍进食后捕捉猎物能力的下降可以通过摄入葡萄糖迅速重现，这使得未来能够研究这些动物饱腹感的神经基础。
