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Responses of Neurons in the Auditory Pathway of the Barn Owl to Partially Correlated Binaural Signals

Albeck, Yehuda and Konishi, Masakazu (1995) Responses of Neurons in the Auditory Pathway of the Barn Owl to Partially Correlated Binaural Signals. Journal of Neurophysiology, 74 (4). pp. 1689-1700. ISSN 0022-3077.

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1. Extracellular single-unit recording in anesthetized barn owls was used to study neuronal response to dichotic stimuli of variable binaural correlation (BC). Recordings were made in the output fibers of nucleus laminaris (NL), the anterior division of the ventral lateral lemniscal nucleus (VLVa), the core of the central nucleus of the inferior colliculus (ICcC), the lateral shell of the central nucleus of the inferior colliculus (ICcLS), and the external nucleus of the inferior colliculus (ICx). 2. The response of all neurons sensitive to interaural time difference (ITD) varied with BC. The relationship between BC and impulse number fits a linear, a parabolic, or a ramp model. A linear or parabolic model fits most neurons in low-level nuclei. Higher order neurons in ICx did not respond to noise bursts with strong negative binaural correlation, creating a ramp-like response to BC. 3. A neuron's ability to detect ITD varied as a function of BC. Conversely, a neuron's response to BC changed with ITD. Neurons in NL, VLVa, and ICcC show almost periodic ITD response curves. In these neurons peaks and troughs of ITD response curves diminished as BC decreased, creating a flat ITD response when BC = 0. When BC was set to -1, the most favorable ITD became the least favorable one and vice versa. The ITD response curve of ICx neurons usually has a single dominant peak. The response of those neurons to a negatively correlated noise pair (BC = -1) showed two ITD peaks, flanking the position of the primary peak. 4. The parabolic BC response of NL neurons fits the prediction of the cross-correlation model, assuming half-wave rectification of the sound by the cochlea. Linear response is not predicted by the model. However, the parabolic and the linear neurons probably do not belong to two distinct groups as the difference between them is not statistically significant. Thus, the cross-correlation model provides a good description of the binaural response not only in NL but also in VLVa and ICcC. 5. Almost all ramp neurons occurred in either ICx or ICcLS where neurons are more broadly tuned to frequency than those in the lower nuclei. The synthesis of this response type requires, however, not only the convergence of different frequency channels but also inhibition between different ITD channels. We modeled the ramp response as a three-step process. First, different spectral channels converge to create broad frequency tuning. The response to variation in BC will be linear (or parabolic) because it is a sum of linear (parabolic) responses. Second, the activity in some adjacent ITD channels is subtracted by lateral inhibition. Finally, the result is rectified using a high threshold to avoid negative activity.

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Additional Information:© 1995 the American Physiological Society. We thank R. Egnor, J. Mazer, K. Mori, L. Proctor, M. Schmidt, T. Takahashi, and T. Yin for critically reading an early draft of the manuscript and providing many helpful remarks. This article also benefited from a very constructive and helpful review by S. Colburn. This work was supported by an International Human Frontier Science Program post-doctoral fellowship to Y. Albeck and National Institute of Neurological Disorders and Stroke Grant DC-00134.
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International Human Frontier Science ProgramUNSPECIFIED
National Institute of Neurological Disorders and Stroke (NINDS)DC-00134
Issue or Number:4
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Official Citation:Responses of neurons in the auditory pathway of the barn owl to partially correlated binaural signals Y. Albeck, M. Konishi Journal of Neurophysiology Published 1 October 1995 Vol. 74 no. 4, 1689-1700
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:62541
Deposited By: Ruth Sustaita
Deposited On:02 Dec 2015 19:01
Last Modified:03 Oct 2019 09:20

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