Searching For Acupuncture Points

 Assuming that the presence of the mysterious field (is photonic in nature) at the crystal will, by reciprocity, cause a resonate frequency of $15.088\,kHz$,

the op amp comparator saturates at its output and turns the LED on.  The crystal is surrounded by water except for a small aparture and is encased in a metal cage to totally block any EMW signals.

If this circuit works, then,

which is a basic AM radio tuned specifically to a low $15.088\,kHz$.  Maybe we can then listern to such a field at 听门穴.

No, no need to jack in; a hole at the back of your neck is not a good idea.