This study in PLOS seems to agree with the results: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0034789 http://journals.plos.org/plosone/ar

This study in PLOS seems to agree with the results: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0034789 http://journals.plos.org/plosone/article?id=10.1371/journal.... This study suggests some measurable effects, though not as simple and direct as the appearance of an EEG band at the target frequency: http://www.researchgate.net/publication/239803901_EEG_Coherence_Effects_of_Audio-Visual_Stimulation_(AVS)_at_Dominant_and_Twice_Dominant_Alpha_Frequency http://www.researchgate.net/publication/239803901_EEG_Cohere...