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Detection of Large Interaural Delays and Its Implication for Models of Binaural Interaction

Saberi, Kourosh and Takahashi, Yoshifumi and Egnor, Roian and Farahbod, Haleh and Mazer, James and Konishi, Masakazu (2002) Detection of Large Interaural Delays and Its Implication for Models of Binaural Interaction. Journal of the Association for Research in Otolaryngology, 3 (1). pp. 80-88. ISSN 1525-3961. PMCID PMC3202365. doi:10.1007/s101620020006.

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The interaural time difference (ITD) is a major cue to sound localization along the horizontal plane. The maximum natural ITD occurs when a sound source is positioned opposite to one ear. We examined the ability of owls and humans to detect large ITDs in sounds presented through headphones. Stimuli consisted of either broad or narrow bands of Gaussian noise, 100 ms in duration. Using headphones allowed presentation of ITDs that are greater than the maximum natural ITD. Owls were able to discriminate a sound leading to the left ear from one leading to the right ear, for ITDs that are 5 times the maximum natural delay. Neural recordings from optic-tectum neurons, however, show that best ITDs are usually well within the natural range and are never as large as ITDs that are behaviorally discriminable. A model of binaural cross-correlation with short delay lines is shown to explain behavioral detection of large ITDs. The model uses curved trajectories of a cross-correlation pattern as the basis for detection. These trajectories represent side peaks of neural ITD-tuning curves and successfully predict localization reversals by both owls and human subjects.

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Additional Information:© 2002 Springer-Verlag. Received: 2 February 2001; Accepted: 26 June 2001; Online publication: 31 August 2001. This work was supported by the NIH. We thank Ben Arthur, Anthony Leonardo, John Culling, and the reviewers for their helpful comments.
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Subject Keywords:interaural, binaural, owl, ITD
Issue or Number:1
PubMed Central ID:PMC3202365
Record Number:CaltechAUTHORS:20151130-075948815
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:62433
Deposited By: Ruth Sustaita
Deposited On:30 Nov 2015 17:48
Last Modified:10 Nov 2021 23:02

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