A Trance is a state of concentration (absorption in something and obliviousness to everything else).  This state provides access to hidden physical and mental resources.  

Hypnosis is a specific kind of trance, in which what one concentrates on is the inner world or the images of the inner mind, and what one is oblivious to is the external world.  This intensified internal awareness provides a gateway to unusual realizations and experiences and can serve as a particularly effective therapeutic tool.

An Ideomotor Signal is a response from the inner mind that yields information unavailable to ordinary consciousness.