From what I understand, later controlled studies do not seem to back the claim that specific frequency differences lead the brain to an alpha state, or theta state etc. as claimed. But there may be potential in reducing anxiety:
R Padmanabhan 1, A J Hildreth, D Laws. "A prospective, randomised, controlled study examining binaural beat audio and pre-operative anxiety in patients undergoing general anaesthesia for day case surgery", Anaesthesia, 2005.
Comments
This is the old scientific American article (from 1973) from where a lot of the claims originate, to my knowledge:
Gerald Oster, "Auditory beats in the brain", Scientific American, 229 (4): pages 94-102, October 1973.
https://www.scientificamerican.com/article/auditory-beats-in...
From what I understand, later controlled studies do not seem to back the claim that specific frequency differences lead the brain to an alpha state, or theta state etc. as claimed. But there may be potential in reducing anxiety:
R Padmanabhan 1, A J Hildreth, D Laws. "A prospective, randomised, controlled study examining binaural beat audio and pre-operative anxiety in patients undergoing general anaesthesia for day case surgery", Anaesthesia, 2005.
https://pubmed.ncbi.nlm.nih.gov/16115248/