A day octopus, Octopus cyanea, sleeps in a tank while its brain activity is recorded. (VIDEO)

Okinawa Institute of Science and Technology (OIST) Graduate University

Caption

The researchers recorded the brain activity of an octopus for 12 hours. Here, the octopus is in active sleep, a stage in which there are rapid changes in color and texture, as well as fast sucker motion.

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Current Biology

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