Taking into consideration what all of the scientific research says, my personal believe is that psychic phenominon is
always misinterpreted normal events that have perfectly rational scientific bases. We might not know everything, but given the body of evidence that's been established, we can pretty much say that what X person is experiencing has a fairly good chance of being based off of Y.
For example,
Penn and Teller did a great Bullshit! episode with a part on Near Death Experiences. (The audio and visual is off a bit, but you only really need to hear what they're saying!) They went into an explanation on how people subjected to the G-Forces in those wacky G-Force machines (not sure what they're called) could have the
same types of experiences that people with standard Near Death Experiences have. Apparently cutting off blood supply to your brain could make you hallucinate! So we can "recreate" Near Death Experiences just like people experience them - what once was thought to be a "psychic" phenominon is now just a normal variation in what could happen in a human's life, given X circumstance.