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Effects of Interaural Intensity Difference on the Processing of Interaural Time Difference in the Owl’s Nucleus Laminaris

Viete, Svenja and Peña, José Luis and Konishi, Masakazu (1997) Effects of Interaural Intensity Difference on the Processing of Interaural Time Difference in the Owl’s Nucleus Laminaris. Journal of Neuroscience, 17 (5). pp. 1815-1824. ISSN 0270-6474. PMCID PMC6573383. doi:10.1523/JNEUROSCI.17-05-01815.1997.

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Interaural time and intensity differences (ITD and IID) are processed independently in the owl’s auditory system. This paper examines whether this independence is established in nucleus laminaris (NL), the first site of ITD processing. A plot of discharge rate against time difference (ITD curve) is sinusoidal in NL. The ITDs that produce the peaks are called the most favorable ITDs, and those that produce the troughs are called the least favorable ITDs. IID had little effect on the discharge rates of laminaris neurons for the most and least favorable ITDs. The degree of peak–trough modulation changed slightly with variation in IID. In contrast, IID in tonal stimuli affected the temporal aspect of ITD curves depending on the difference between the stimulus frequency and the neuron’s best frequency (BF). For frequencies below BF, IID caused large and systematic shifts in ITD toward the ear in which the sound was louder, whereas for frequencies above BF, IID caused small shifts in ITD toward the opposite ear. IID had little effect on ITD curves taken with BF or broadband noise. These results can be largely accounted for by the effects of frequency and intensity on the timing of impulses at the level of the cochlear nuclei. Thus, the processing of ITD by NL neurons is independent of IID for behaviorally relevant stimuli, because the timing of impulses is insensitive to sound level when the signal is broadband.

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Additional Information:© 1997 Society for Neuroscience. For the first six months after publication SfN’s license will be exclusive. Beginning six months after publication the Work will be made freely available to the public on SfN’s website to copy, distribute, or display under a Creative Commons Attribution 4.0 International (CC BY 4.0) license ( Received Sept. 19, 1996; revised Dec. 4, 1996; accepted Dec. 16, 1996. This work was supported by National Institute of Neurological Disorders and Stroke Grant DC-00134 and postdoctoral fellowships from the Deutsche Forschungsgemeinschaft (S.V.) and the Pew Latin American Fellows Program (J.L.P.). We thank Jamie Mazer and Chris Malek for assistance with computer programming, Yehuda Albeck for advise on data analysis, and Yehuda Albeck, Ben Arthur, Catherine Carr, Roian Egnor, Jamie Mazer, Walter Metzner, Terry Takahashi, Larry Proctor, and Marc Schmidt for reading early versions of this manuscript.
Funding AgencyGrant Number
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
Pew Latin American Fellows ProgramUNSPECIFIED
National Institute of Neurological Disorders and Stroke (NINDS)UNSPECIFIED
Subject Keywords:owl; sound localization; nucleus laminaris; interaural time difference; interaural intensity difference; parallel pathways
Issue or Number:5
PubMed Central ID:PMC6573383
Record Number:CaltechAUTHORS:20151202-111751217
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Official Citation:Effects of Interaural Intensity Difference on the Processing of Interaural Time Difference in the Owl’s Nucleus Laminaris. Svenja Viete, José Luis Peña, Masakazu Konishi. Journal of Neuroscience 1 March 1997, 17 (5) 1815-1824; DOI: 10.1523/JNEUROSCI.17-05-01815.1997
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:62543
Deposited By: Ruth Sustaita
Deposited On:02 Dec 2015 19:35
Last Modified:10 Nov 2021 23:03

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