Sensory deprivation

Mickey, a postman is seeing mosquitoes and fighter planes buzzing around his head and it's frightening him.

Claire a psychology student doesn't mind the little cars, snakes and zebras. But she gets scared when she suddenly feels somebody is in the room.

"In the dark room there is nothing to focus on," says Prof Robbins as he monitors their behaviour. "In the absence of information the human brain carries on working and processing information even if there is no information to process and after a while it starts to create that information itself."

More here.