Although jellyfish do not have a brain or spinal cord, they show an impressive ability to learn. Even without a central nervous system, they are capable of associative learning. For example, Caribbean jellyfish can avoid obstacles by learning from their own mistakes.

T. cystophora jellyfish are about the size of a human fingernail and live in mangrove swamps, they have 24 eyes that help them avoid dangers.

Although jellyfish do not have a brain, they do have structures called “rhopalia”, they contribute to the perception of the environment. Researchers have investigated such systems, proving that jellyfish can react to stimuli and learn from mistakes.

These discoveries will make it possible in the future to better investigate the evolution of the nervous systems of simpler organisms and help to understand how complex brain activity similar to that of humans developed over time.

Commentary