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How Independent Are the Pitch and Interaural-Time-Difference Mechanisms That Rely on Temporal Fine Structure Information?

  • Shigeto Furukawa
  • Shiho Washizawa
  • Atsushi Ochi
  • Makio Kashino
Conference paper
Part of the Advances in Experimental Medicine and Biology book series (volume 787)

Abstract

The temporal fine structure (TFS) of acoustical signals, represented as the phase-locking pattern of the auditory nerve, is the major information for listeners performing a variety of auditory tasks, e.g., judging pitch and detecting interaural time differences (ITDs). Two experiments tested the hypothesis that processes for TFS-based pitch and ITD involve a common mechanism that processes TFS information and the efficiency of the common mechanism determines the performance of the two tasks. The first experiment measured the thresholds for detecting TFS-based pitch shifts (Moore and Moore, J Acoust Soc Am 113:977–985, 2003) and for detecting ITD for a group of normal-hearing listeners. The detection thresholds for level increments and for interaural level differences were also measured. The stimulus was a harmonic complex (F0 = 100 Hz) that was spectrally shaped for the frequency region around the 11th harmonic. We expected a positive correlation between the pitch and ITD thresholds, based on the hypothesis that a common TFS mechanism plays a determinant role. We failed to find evidence for a positive correlation, hence no support for the above hypothesis. The second experiment examined whether perceptual learning with respect to detecting TFS-based pitch shifts via training would transfer to performance in other untrained tasks. The stimuli and tasks were the same as those used in the first experiment. Generally, training in the pitch task improved performance in the (trained) pitch task, but degraded the performance in the (untrained) ITD task, which was unexpected on the basis of the hypothesis. No training effect was observed in the other untrained tasks. The results imply that the pitch and ITD processes compete with each other for limited neural resources.

Keywords

Interaural Time Difference Trained Group Interaural Level Difference Pitch Perception Adaptive Tracking 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Shigeto Furukawa
    • 1
  • Shiho Washizawa
    • 1
    • 2
  • Atsushi Ochi
    • 1
    • 3
  • Makio Kashino
    • 1
    • 2
  1. 1.NTT Communication Science LaboratoriesNTT CorporationAtsugi, KanagawaJapan
  2. 2.Interdisciplinary Graduate School of Science and EngineeringTokyo Institute of TechnologyKanagawaJapan
  3. 3.Department of Otolaryngology, Faculty of MedicineUniversity of TokyoTokyoJapan

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