“Researchers in Chicago have built a cyborg, a half-living,
half-robot creature which connects the brain of an eel-like fish to
a computer and is capable of moving towards lights.

The device, developed at a research centre owned by Evanston’s
Northwestern University, consists of the brain stem from the
larva of a lamprey, a bloodsucking fish, attached by electrodes
to an off-the-shelf Swiss robot.” The Guardian