What makes squid and dog brains similar – study


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Australian researchers have seen an MRI scan of a squid’s brain, Sepioteuthis lessoniana, that its complexity is comparable to that of a dog’s brain. The results of the study have been published in the specialist magazine “iScience”.

modern cephalopods, including Octopuses, cuttlefish and squidhave a very complex brain. Scientists from the University of Queensland led the way sheet for the first time a detailed Magnetic resonance study of the squid brain through and created one Atlas of its neural connections,

99 percent of the 282 previously identified backbones were confirmed. In addition, the researchers identified 145 previously unknown chains. Over 60 percent of all squid neuronal connections are involved in visual and motor functions. Due to the Complexity of its structure it turned out Squid’s brain near that of the dog,

“Modern cephalopods, a group of octopuses, cuttlefish and cuttlefish, have an extremely complex brain that, in terms of the number of neurons in the brain, comes close to that of a dog and surpasses the brain of mice and rats,” the words in a university press release by the first author of the article, Wen-Sung Chung from the Queensland Brain Institute.

“For example, some cephalopods have more than 500 million neurons – compared to 200 million in rats or 20,000 in common molluscs,” says the researcher.
This explains examples of the complex behavior cephalopods, including the ability to instantly change color to camouflage and communicate with each other using a variety of signals.
“We see that many neural circuits are designed for camouflage and visual communication, enabling squids to evade predators, hunt successfully, and interact with one another through dynamic color changes,” says Chung.

The discovered Similarity of the central nervous system of cephalopods with vertebrates according to the authors, confirms the Convergence hypothesis of evolution, according to which organisms in different groups independently develop similar characteristics.

“The similarity to the well-studied vertebrate nervous system enables us to predict the function of the cephalopod nervous system at the behavioral level,” emphasizes the scientist.

“For example, we have some new ones Neural networks figured out for behavior with visual control like Camouflage considering the shadow, are responsible – when squids take on a different color so that they fit better into the background, ”says the researcher.

In the next phase of the study, the scientists want to find out why different types of cephalopods have developed different parts of the brain in the course of evolution.

“We hope the results will help us understand why these amazing creatures have such different behaviors and examples of complex interactions,” said Chung.

ek / mt / sna


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