This would be a tricky one for me to answer.
I already practice Reiki and other energy and meridian based therapies before I came to the lifeflow brain entrainment, so I couldn't tell you if brain entrainment has any effect on our ability to notice energy fields or not. I would guess that, like a lot of techniques, from meditation to tai chi etc. these can all be a gateway to new perceptions.
Hugs
Giles