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January 10, 2020 03:30 am

Scientists Give Cuttlefish 3D Glasses To Prove They Perceive Depth

New submitter wolff000 writes: A group of researchers at the University of Minnesota have shown that cuttlefish see in 3D. They did this by making 3D glasses and then showing the cuttlefish movies of prey. "While cuttlefish wearing glasses is an unexpected sight, a University of Minnesota-led research team built an underwater theater and equipped the cephalopods with specialized 3D glasses to investigate how cuttlefish determine the best distance to strike moving prey," a report says. "The initial act of getting cuttlefish to willingly wear the glasses without trying to take them off and actually watch the screen was tough enough," reports Popular Science. "This process required gluing velcro to the top of its mucus-covered body, placing the glasses on their heads, and keeping the creatures happy and distracted enough to not mess with them (or ink all over the experiment). But when the animals finally focused on the screen, creating an illusion of depth that can only be seen when using binocular vision, they accurately 'hunted' the shrimp on screen." "This illusion of depth is created by using two different colored images that are seen through the two different lenses, which the brain then calculates the distance between," the report adds. "Even though cuttlefish are colorblind, the colored filters in the glasses send the accurate color from the monitor to the right eye. They only see the image in each eye as a variety of greyscale intensities." The study has been published in the journal Scientific Advances.

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