Criticism The Oohashi et al 2006 results reveal some interesting contradictions While full bandwidth sound was preferred to CD limited bandwidth over a speaker the test for the ultrasonic music band was inaudible when reproduced alone Additionally the preference for HFC was not replicated when using headphones only with speaker presentation ruling out the ear as the means by which the effect was produced These are not contradictions They are an essential feature of the study specified and discussed in the paper There is no contradiction here Out it goes Contrary evidence and ABX tests Oohashi et al pictured human brains when the test persons were either exposed or not exposed to ultrasonic stimulus ABX tests only tell what differences test persons consciously perceive or not during the test If same research methods had been used and results were drastically different that should be called contradictory I will state that even more generally than previous There are certainly many signals and irritants that human beings can be unconsciously exposed to but nevertheless they affect human s well being and happiness For example several chemicals or radioactivity would do that We just don t know the whole truth about ultrasonic signals yet Some signals could be processed half consciously in human s brains One feels restless or nervous but still does not know why