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Cortical Temporal Integration Window for Binaural Cues accounts for Sluggish Auditory Spatial Perception

View ORCID ProfileRavinderjit Singh, View ORCID ProfileHari M. Bharadwaj
doi: https://doi.org/10.1101/2021.12.14.472656
Ravinderjit Singh
aWeldon School of Biomedical Engineering, Purdue University, West Lafayette, IN, United States
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  • ORCID record for Ravinderjit Singh
Hari M. Bharadwaj
aWeldon School of Biomedical Engineering, Purdue University, West Lafayette, IN, United States
bDepartment of Speech, Language, and Hearing Sciences, Purdue University, West Lafayette, IN, United States
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Abstract

The auditory system has exquisite temporal coding in the periphery which is transformed into a rate-based code in central auditory structures like auditory cortex. However, the cortex is still able to synchronize, albeit at lower modulation rates, to acoustic fluctuations. The perceptual significance of this cortical synchronization is unknown. We estimated physiological synchronization limits of cortex (in humans with electroencephalography) and brainstem neurons (in chinchillas) to dynamic binaural cues using a novel system-identification technique, along with parallel perceptual measurements. We find that cortex can synchronize to dynamic binaural cues up to approximately 10 Hz, which aligns well with our measured limits of perceiving dynamic spatial information and utilizing dynamic binaural cues for spatial unmasking, i.e. measures of binaural sluggishness. We also find the tracking limit for frequency modulation (FM) is similar to the limit for spatial tracking, demonstrating that this sluggish tracking is a more general perceptual limit that can be accounted for by cortical temporal integration limits.

Competing Interest Statement

The authors have declared no competing interest.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted December 16, 2021.
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Cortical Temporal Integration Window for Binaural Cues accounts for Sluggish Auditory Spatial Perception
Ravinderjit Singh, Hari M. Bharadwaj
bioRxiv 2021.12.14.472656; doi: https://doi.org/10.1101/2021.12.14.472656
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Cortical Temporal Integration Window for Binaural Cues accounts for Sluggish Auditory Spatial Perception
Ravinderjit Singh, Hari M. Bharadwaj
bioRxiv 2021.12.14.472656; doi: https://doi.org/10.1101/2021.12.14.472656

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