The Hawthorne Effect in EEG Biofeedback and Subliminal Training07/01/2016 Tagged With: add, ADHD, depression, EEG Biofeedback, Hawthorne, insomnia, ne;urofeedback, subliminalThe Hawthorne Effect in EEG BF and Subliminal Training and in Education. If understood, it poses no real threat as shown in several Subliminal tests.