...Frank Ragozzine Shepard (1964) found that the pitch height of a pair of octave-related complex tones is perceived in accordance with the principle of proximity around a pitch class circle. However, when these tones form a tritone interval, proximity cannot be used. In the tritone paradox, Deutsch...

... tritone tritone paradox action perception ambiguous melodies No Effect of Action on the Tritone Paradox 315 Music Notation, But Not Action on a Keyboard, Influences Pianists Judgments of Ambiguous Melodies Bruno H. Repp Haskins Laboratories Robert M. Goehrke Yale University pitch increases from...