On binaural beats.
Binaural beats have been investigated in normal volunteers using high-stable synthesizers. There are considerable differences between the subjective rhythm heard and the difference of the two frequencies, indicating that this dissimilarity must be caused centrally.
D000161:Acoustic Stimulation; D003201:Computers; D006309:Hearing / Q000502:physiology*; D006801:Humans; D010507:Periodicity