Using the database Web of Science, a systematic search for literature on learning in Cnidaria, both non-associative and associative, was conducted. Cnidaria comprise hydras, box jellies, (true) jellyfish, corals, and sea anemones, a group of animals possessing diffuse networks of nerves known as nerve nets or neural nets. Being neighbors on the animal evolutionary tree to bilaterian animals, the vast collection of (mostly) bilaterally symmetric animals with brains ranging from tiny worms to giant whales, the cognitive capacities of Cnidaria inform the evolution of nervous systems and cognition in bilateria. I failed to find literature on learning in corals and box jellies. Habituation has been amply shown in hydras, jellyfish, and sea anemones, while sensitization has been studied in detail in sea anemones, including some neurobiological details in the release of nematocysts or poisoned darts for capturing prey. One well-controlled study found evidence for classical conditioning with shock in sea anemones, in addition to two other lesser-controlled demonstrations. The relevance of associative learning in sea anemones, embodied cognition, and representationsal issues when it comes to animals without central brains is discussed.

使用数据库 Web of Science，系统搜索了关于刺胞动物学习的文献，包括非关联性和关联性。刺胞动物包括九头蛇、箱形水母、（真正的）水母、珊瑚和海葵，这是一组拥有被称为神经网络或神经网络的弥散神经网络的动物。作为动物进化树上双边动物的邻居，大量（主要是）双边对称动物的大脑范围从微小的蠕虫到巨型鲸鱼，刺胞动物的认知能力为双边动物的神经系统和认知的进化提供了信息。我没有找到关于在珊瑚和盒状果冻中学习的文献。水螅、水母和海葵的习性已被充分显示，而海葵的致敏作用已得到详细研究，包括释放刺丝囊或毒镖以捕获猎物的一些神经生物学细节。一项控制良好的研究发现了海葵经典条件反射的证据，此外还有另外两个控制较少的演示。讨论了海葵中联想学习、具身认知和表征问题的相关性，当涉及到没有中枢大脑的动物时。