Plain-body octopus can be duplicated to think a fake arm themselves
Sumire Kawashima and Yuzuru Ikeda / University of the Ryukyusus
Like people, octopuses can be tricky in an illusion that makes them think a fake arm is true to them.
First shown in the late 1990s, the iliut of rubber rubber involves concealing a person’s real hand and put a fake one on a table in front of them, then pulling out simultaneously. Later, it was found to be other mammals, such as micecan also be deceived by the same trick.
Now, Sumire Kawshima and Yuzuru IEDA At the University of the Ryukyus in Okinawa, Japan, discovered that the octopus could easily agree with illusion.
https://www.youtube.com/watch?v=f8AJPlo0qyy
For study, captured plains field (Callistocopus Aspatosomatis) placed in an experimental tank. A fake arm of octopus made of soft gel attached to an opaque partition is placed on top one of the arms of Octopus, blocking the view of real arms. Then one of the researchers used plastic calliper to stroke the fake arm and the real arm at the same time.
After about 8 seconds, the researcher enters a fake arm with twezers. All six of the octopus participated in the 24 attempts in this test reflect defense answers, such as color change, withdraw their arms or flight.
If the test was held without stroking or the inadvertent striking, or if the posture of fake arm did not match the true arm, then the effect of illusion was lost.
In the experiment, octopus will see a fake arm on top of a partition hiding their true arm
Sumire Kawashima and Yuzuru Ikeda / University of the Ryukyusus
The experiment shows a benefit and an error in human brain wiring and octopus, as the Ikeda. “The illustration suggests the ability of octopus to expect and to predict, useful for survival,” he said. “On the other hand, this ability to rise as an impact on an error or conflict of brain processing and also an error.”
Kawashima said the study increases the list of abilities shared by people’s octopus. “Our findings suggest that Octopus can be an important model for studying the evolution of the feeling of physical ownership,” he said.
Pedro Giridfrey-Smith At the University of Sydney, Australia, says the results were unexpected for him. “It suggests octopuses have a rich body image,” he said. “I stuck in the fact that ‘posture incongration’ condition works like doing: octopuses do not see the rubber arms as their own in case, despite the case.”
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