The Rapid Decline in Interaural-Time-Difference Sensitivity for Pure Tones Can Be Explained by Peripheral Filtering.
Binaural display
Binaural models
Binaural physiology
Interaural time difference
Spatial hearing
Journal
Journal of the Association for Research in Otolaryngology : JARO
ISSN: 1438-7573
Titre abrégé: J Assoc Res Otolaryngol
Pays: United States
ID NLM: 100892857
Informations de publication
Date de publication:
20 May 2024
20 May 2024
Historique:
received:
02
09
2023
accepted:
28
04
2024
medline:
21
5
2024
pubmed:
21
5
2024
entrez:
20
5
2024
Statut:
aheadofprint
Résumé
The interaural time difference (ITD) is a primary horizontal-plane sound localization cue computed in the auditory brainstem. ITDs are accessible in the temporal fine structure of pure tones with a frequency of no higher than about 1400 Hz. How listeners' ITD sensitivity transitions from very best sensitivity near 700 Hz to impossible to detect within 1 octave currently lacks a fully compelling physiological explanation. Here, it was hypothesized that the rapid decline in ITD sensitivity is dictated not by a central neural limitation but by initial peripheral sound encoding, specifically, the low-frequency (apical) portion of the cochlear excitation pattern produced by a pure tone. ITD sensitivity was measured in 16 normal-hearing listeners as a joint function of frequency (900-1500 Hz) and level (10-50 dB sensation level). Performance decreased with increasing frequency and decreasing sound level. The slope of performance decline was 90 dB/octave, consistent with the low-frequency slope of the cochlear excitation pattern. Fine-structure ITD sensitivity near 1400 Hz may be conveyed primarily by "off-frequency" activation of neurons tuned to lower frequencies near 700 Hz. Physiologically, this could be realized by having neurons sensitive to fine-structure ITD up to only about 700 Hz. A more extreme model would have only a single narrow channel near 700 Hz that conveys fine-structure ITDs. Such a model is a major simplification and departure from the classic formulation of the binaural display, which consists of a matrix of neurons tuned to a wide range of relevant frequencies and ITDs.
Identifiants
pubmed: 38769250
doi: 10.1007/s10162-024-00949-y
pii: 10.1007/s10162-024-00949-y
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Subventions
Organisme : NIDCD NIH HHS
ID : R01DC014948
Pays : United States
Organisme : NIDCD NIH HHS
ID : R01DC016643
Pays : United States
Organisme : NIDCD NIH HHS
ID : R01DC017924
Pays : United States
Informations de copyright
© 2024. The Author(s) under exclusive licence to Association for Research in Otolaryngology.
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