As the title says, I want to determine if Brainwave Entrainment is halaal or haraam?
Brainwave Entrainment in Wikipedia:
Brainwave Entrainment is any practice that aims to cause brainwave frequencies to fall into step with a periodic stimulus having a frequency corresponding to the intended brain-state (for example, to induce sleep), usually attempted with the use of specialized software. It purportedly depends upon a "frequency following" response on the assumption that the human brain has a tendency to change its dominant EEG frequency towards the frequency of a dominant external stimulus. Such a stimulus is often aural, as in the case of binaural or monaural beats and isochronic tones, or else visual, as with a dreamachine, a combination of the two with a mind machine, or even electromagnetic radiation.
And about subliminal messaging:
Kaser, V.A. "The Effects of an Auditory Subliminal Perception Message Upon the Production of Images and Dreams". Journal of Nervous and Mental Disease (1986). Subjects listened to an audio subliminal message. The message was mixed with a regular music recording. Another group of subjects simply listened to the regular music recording without the subliminals. Both groups were asked to create a pre-test drawing before and immediately after the music was played as well as a drawing of any dreams they had the previous night. When the drawings were examined, the effects of the subliminal message could be seen. The drawings of the people who listened to the music with subliminal hidden content contained images relating to the suggestions they were listening to, whereas no correlation could be found with the control group. Kaser concluded that "the unconscious/subconscious mind is able to perceive a recorded verbal message that cannot be consciously heard", proving the existence of subliminal perception
The explanation behind subliminal message is giving suggestion to penetrate to subconscious and it repeated many times. The purpose form me is for self help. If after listen the brainwave or subliminal message audio and giving result, I believe this is from Allah.