Despite his The Scientist's best efforts in life, after a few decades Mika adapts to his predicament. Though notes were left on how to keep the brains alive, he had not documented how to keep them from developing physical changes after years of interaction with the simulation apparatus. Neural pathways eventually formed to allow Mika to enter a state of zen. Though the simulation continued to force him to thrash, scream and be constantly horny, he only became aware whenever there was an issue with his maintenance schedule (which happened maybe once a year). If nothing changed, Mika would almost be content to exist in this state indefinitely.
Unfortunately outside the simulations Mika's jar sat on a table; one of two dozen, lined up in front of a class of eager students.
"Okay, everyone take a jar and return to your bench." ordered the old professor at the front, "Observe the interface and the brain's physical reaction to particular stimuli. Feel free to poke around a bit to provide different stimuli but remember these have been donated to us so be VERY careful."