Phantom limbs
I thought this article about phantom limbs was interesting, and may say something about how our brains are to a degree pre-wired to expect certain sensory input.
The patient was born with a deformed hand that didn't have several fingers. After a bad accident that required the amputation of that hand, she started having phantom pains of a 5-fingered hand that she had never had.
Click here for the article: "Phantom Finger Points to Secrets in the Brain"