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Octopuses can " see " light with their munition , even when their eyes are in the night , researchers have found . When the arms of the octopus detect brightness level , the eight - armed animate being pulls them close to their body .
Becauseoctopusesgenerally have a poor sensory faculty of where their body is in space , this complex natural behavior might help protect their arms from the pincers of predator nearby that they might otherwise not sense .
Scientists have long get laid that devilfish arm respond to light source . Their hide is covered in paint - filled organs called chromatophores that reflexively change color when break to light . These chromatophores are responsible for the octopus ’s coloring - changing camouflage superpowers . In fact , it was while studying these light - bring on chromatophore responses that Tal Shomrat and Nir Nesher of the Ruppin Academic Center in Israel noticed something odd .
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At the time , an undergraduate bookman in their research laboratory was shining lustrous lights on devilfish arms to elicit a chromatophore response . But the devilfish was not cooperating .
" We were using a very strong flashlight and when we illuminate the tip of the arm , it would always pull away . It was very surprising , " Shomrat tell LiveScience . " We budge our experiment to research this behavior after we find out that nobody had describe it before . "
Their new experimentation involved place an devilfish in a tank cover in an opaque smuggled tarp . The octopus , kept in the night , was trained to reach an arm through a minor trap in the top of the storage tank to find pieces of Pisces . While the octopus was blindly feeling around for a piece of food , the researchers would radiate a shiny luminosity on the octopus ’s arm at a random time ; about 84 % of the meter when they shine the spark , the octopus would rapidly pull its arm away , suggesting that the devilfish is able to smell and respond to light with its arms , even when they ca n’t see the light with their eyes .
" We often feel the heat from vivid light , but for the octopus , this is n’t the showcase , " Neshir said . " In our experiments , we checked for changes in temperature and there were n’t any . The effect is from pure Inner Light . "
Having established that octopus arm can sense and react to light , their next step was to explore what see this response . Is it a bare reflex controlled entirely by neurons — or peculiar nerve cells — in the arm , or is it controlled by the nous ?
To resolve this enquiry , they do a few additional experiments . First , they illuminated different parts of the octopus ’s branch to ascertain the area most sore to Light Within . They found that the tip of the weapon system was the most sensitive to it .
Next , they crystalize the weapons system of several anesthetized octopuses . If swooning avoidance were wholly based on a local instinctive reflex , it might occur in an unconscious devilfish . However , while the chromatophores in the slumber octopus reflexively reacted to the light , the arms did n’t take out away .
When the scientists hack the heftiness at the substructure of the arms , that also eliminated the limb recantation . Put together , the studies suggest that the subdivision is sensing the light , sending a message to the Einstein through nerves in the brawniness , and the brain is telling the octopus to move the arm .
One of Shomrat and Neshir ’s experiments confirmed this , too . When they would shine the igniter on a small-arm of Pisces the Fishes , the devilfish would initially avoid the food before seemingly deciding to reverse its instincts and grab the Pisces the Fishes anyway .
" The fact that this behavior is not a reflex , but rather controlled by higher - degree cognition in the encephalon is riveting , " said Eduardo Sampaio , an octopus behaviour researcher at the University of Lisbon in Portugal , who was not involved in the study .
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Shomrat and Neshir think this chemical reaction may have evolved as a room for the octopus to protect its arms from predatory animal . They say that predators that hunt by sight might slip a misplaced devilfish arm for a worm or small Pisces the Fishes . Being able to feel lighting with the tip of the arm might avail the octopus keep its arm out of harm ’s way .
" The behavior is so racy and obvious , it is interesting that nobody had described it before , " Shomrat said . " Now , our next step are to look into the development and purpose of the behaviour . "
Shomrat , Nesher and Itamar Katz , also of the Ruppin Academic Center , issue their findings on-line Feb. 3 in theJournal of Experimental Biology .
Originally published on Live Science .
