Even without a central brain, jellyfish can learn from past experiences like humans, mice, and flies.
And it’s a no-brainer that it must use its brain, right? Well, no, because just like most jellyfish, T.doesn’t possess a single centralized brain. Box jellyfish may lack a brain, but they use two dozen eyes. It has a concentration of neurons in its four eye-bearing sensory structures, which it uses for visual processing and to navigate using landmarks above the water.
The box jellyfish demonstrated a type of associative learning that has previously only been demonstrated in bilaterian animals like vertebrates, arthropods, and mollusks. Associative learning happens through conditioning. For example, if you touch a hot iron and it burns you, then you may associate the hot iron with pain and get conditioned not to repeat touching the iron again.
“If you want to understand complex structures, it’s always good to start as simple as you can,” said Anders Garm, senior author of the paper. “Looking at these relatively simple nervous systems in jellyfish, we have a much higher chance of understanding all the details and how it comes together to perform behaviors.”Two unrelated elements become connected in our brains.
The team found that within 7 minutes and 30 seconds of the trial period, the jellyfish learned to significantly increase the distance to the arena wall and the frequency of avoidances. Importantly, they also more than halved their wall contacts. The team concluded that these results suggest associative learning in T.“It’s surprising how fast these animals learn; it’s about the same pace as advanced animals are doing,” added Garm.
Jellyfish are notorious for one other thing. Their sting may cause prolonged pain or even result in death. T.The study was published in the journalAssociative learning, such as classical or operant conditioning, has never been unequivocally associated with animals outside bilatarians, e.g., vertebrates, arthropods, or mollusks. Learning modulates behavior and is imperative for survival in the vast majority of animals.
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