Abstract
Systematic data on melodic interval recognition by 3 musically experienced human subjects with sounds whose missing fundamentals were represented by 2 nonsuccessive harmonics delivered to separate ears were presented. Three theories, the optimum processor theory, the virtual pitch theory and the pattern transformation theory, were discussed. For each theory, a constraint on performance is proposed based on interference between the analytic and synthetic pitch perception modes. The former is obtained with large spacings between harmonics, where listeners are more likely to perceive harmonics as individual tones, each having their own pitch. This degrades the listener''s ability to hear the fundamental pitch.

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