Zoe, I’m not the one who made the “a priory” statement (although I agree with it) but it is NOT an a priori statement to say that the impossible is impossible.
Let’s take one aspect of alleged psychic ability, psychokinesis, or the ability to move objects with the mind. To move an object requires force. There is simply no mechanical way to generate the reqisite force simply by thinking about. Even if it WERE possible, this force would be detectable, measurable, and quantifiable to scientific inquiry. All energy is detectible.
How about mind reading? How does this work logistically? What is the theory by which one closed biochemical system can interface with another through the air. This is like saying that I can put a tape in my VCR and have it play back on your television. This would be impossible. That is not an a priori assertion, it is flat statement of fact.
IANA physicist, (and that is an understatement) but it is my understanding that any quantum violations of physics occur only on a subatomic level. I’m not aware of any way at all in which quantum theory could be applied to psychics, but i am willing to listen.
The main problem, though, is that for science to study psychic phenomena in any meaningful way, it first must OBSERVE psychic phenomena. Despite many sincere attempts to do so, not one instance of such ability has ever been observed under laboratory conditions, or dispositively verified under ANY condition.
So here we have claims for extraordinary phenomena which seem
a)prima facia impossible, and
b)have never been observed or confirmed by science.
Furthermore, every well-known “psychic” who claims to have such abilities ( John Edward, Kreskin, Uri Gellar, the “pet psychic,” etc.) has been effectively (and rather effortlessly) debunked by skeptics.
Please show me one compelling reason that the existence of psychic phenomena deserves any more consideration than the existence of werwolves or leprechauns.