声音/音乐感知中的一个未解之谜
An Unsolved Puzzle in Sound / Music Perception

吴全丰 (Charles Q. Wu)

Physically, the frequency of air vibration is one-dimensional; perceptually, however, the quality of pitch is like a two-dimensional helix: it goes from low to high, but it is circular as well in that two pitches an octave apart sound similar to each other (see the attached picture).

Pitch circularity is a perceptual phenomenon -- it must be due to something in the human brain while perceiving or feeling sound or music. Why so? Although recently there has been some research on this phenomenon, it largely remains as an unsolved puzzle in perceptual psychology and neuroscience.

A familiar yet still fascinating phenomenon indeed. Interested? Read a good review paper on pitch circularity by Diana Deutsch listed at: http://en.wikipedia.org/wiki/Pitch_circularity

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