Psychic people generally notice that they’re different from other people in ways that they can’t quite define, but it seems to be more than just psychic ability. While it’s been shown that most of the world has some level of psychic ability, the distribution is not even. Some people are far more psychic than others. The reasons for this are many and they trace back to a biological predisposition towards psychic ability. People who are very psychic were born that way.
Psychic ability itself is a byproduct of a much larger process that is basically a biological predisposition towards sensitivities of all sorts, including environmental and emotional. For that reason, David Ritchey, in his book The HISS of the ASP refers instead to Anomalously Sensitive Person, or ASP instead of the more culturally loaded term, “psychic.” According to Ritchey:
https://weilerpsiblog.wordpress.com/2012/08/11/the-physiology-of-psychic-people-and-psychic-ability/