Biofeedback is an alternative medicine with the intent to give the patient greater awareness of their physiological functions, which will supposedly help the patient control these processes. With this premise, it is
unsuprising that some claims are utter bullshit.
There is some evidence that shows that biofeedback could potentially help with stress.
Some take biofeedback one step further and claims unsubstantiated and embarassing crap that would make anyone with any dignity ashamed, and that's why many of these claims are made by quacks, cranks and new agers. These include claims of more desirable brainwaves, being able to reach spiritual or higher consciousness and just stuff that is impossible for the human body to do.
- Biofeedback. Mayo Clinic.