Head movement (Al Bregman )


Subject: Head movement
From:    Al Bregman  <bregman(at)HEBB.PSYCH.MCGILL.CA>
Date:    Sun, 18 Dec 2005 00:58:36 -0500

Hi Pierre and List, In addition, as you move your head, the change in amplitude in the high frequencies, -- resulting from different positions of the ear relative to the head's shadowing of the sound source -- will be different for sound sources that are at different angles from the head. Physically, the rotation of the head affects the sound in a similar way as rotating the set of sound sources around the head. However, we don't know whether the efferent motor signal plays a role, in the case of voluntary head movement. Best wishes, Al ----- Original Message ----- From: "Pierre Divenyi" <pdivenyi(at)EBIRE.ORG> To: <AUDITORY(at)LISTS.MCGILL.CA> Sent: Saturday, December 17, 2005 11:35 AM Subject: : 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 sources. > > Pierre Divenyi > > **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.


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