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: Sound Source Segregation and head motion
Head motion temporarily changes a stationary source into a moving object.
In the early 90's, Chandler and Grantham showed that the detectable angle
of a moving object is inversely proportional to its bandwidth. In a
theoretical paper** we showed that this trade-off is a property of
physics -- in other words, motion changes spectral resolution and
vice-versa. Consequently, by moving his/her head the listener can
introduce subtle spectral cues that could be potentially useful for
disambiguating spectral grouping of one or more simultaneously present
**Divenyi, P. L. & Zakarauskas, P. (1992). "The effect of
bandwidth on auditory localization: An estimation theory model",
Auditory Physiology and Perception, edited by Cazals, Y., Demany,
L. & Horner, K., (Pergamon Press, London) pp. 563-570.