Multi-Channel Transdermal Stimulation of the Brain
http:// www.dtic.mil/dtic/tr/fulltext/u2/702525.pdf
Method and system for providing pulsed electrical stimulation to a craniel nerve of a patient to provide therapy for neurological and neuropsychiatric disorders
https:// patents.google.com/patent/US7191012
Get a big read warning with the site, here's the youtube video presentation from Michael Persinger on that link:
Michael Persinger on No More Secrets
https:// www.youtube.com