Many people are skeptical of psychic ability, and others want scientific proof. Dean Radin, the author of Entangled Minds: Extrasensory Experiences in a Quantum Reality, says he, too, was skeptical at first, but now he thinks it's clear that some psychic abilities exist. "What they suggest is that experience is entangled, is interconnected among people," Dean says.

Dean says there are more than 1,000 experiments concerning psychic phenomena that have been published in peer-reviewed scientific journals, and that many scientists are simply unaware of them. Allison even participated in a study for four years at a university in Arizona. "Science is made into very deep specialties. You know about your one area, but you may not know what's happening in the next area," Dean says.

Both Allison and Dean say psychic abilities are like having an extra talent. Dean compares having psychic abilities to being a phenomenal athlete, like Tiger Woods. "Some people have very different skills, and mediums like Allison are able to do things that the rest of us can do to a very small extent, but they can do it more reliably," he says.

"I see mediums like—there are canines that can hear a whistle that human beings can't hear. There are some people who can hear on a level that other people can't hear," Allison says. "We just hear at a higher level."