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Journal of the Acoustical Society of America / Volume 131 / Issue 2 / PSYCHOLOGICAL ACOUSTICS [66]

Pitch contour identification with combined place and temporal cues using cochlear implants

J. Acoust. Soc. Am. Volume 131, Issue 2, pp. 1325-1336 (2012); (12 pages)

Xin Luo1, Monica Padilla2, and David M. Landsberger2

1Department of Speech, Language, and Hearing Sciences, Purdue University, 500 Oval Drive, West Lafayette, Indiana 47907
2Division of Communication and Auditory Neuroscience, House Research Institute, 2100 West Third Street, Los Angeles, California 90057

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This study investigated the integration of place- and temporal-pitch cues in pitch contour identification (PCI), in which cochlear implant (CI) users were asked to judge the overall pitch-change direction of stimuli. Falling and rising pitch contours were created either by continuously steering current between adjacent electrodes (place pitch), by continuously changing amplitude modulation (AM) frequency (temporal pitch), or both. The percentage of rising responses was recorded as a function of current steering or AM frequency change, with single or combined pitch cues. A significant correlation was found between subjects’ sensitivity to current steering and AM frequency change. The integration of place- and temporal-pitch cues was most effective when the two cues were similarly discriminable in isolation. Adding the other (place or temporal) pitch cues shifted the temporal- or place-pitch psychometric functions horizontally without changing the slopes. PCI was significantly better with consistent place- and temporal-pitch cues than with inconsistent cues. PCI with single cues and integration of pitch cues were similar on different electrodes. The results suggest that CI users effectively integrate place- and temporal-pitch cues in relative pitch perception tasks. Current steering and AM frequency change should be coordinated to better transmit dynamic pitch information to CI users.

© 2012 Acoustical Society of America

ACKNOWLEDGMENTS

We are grateful to all subjects for their participation in the experiments. Research was supported in part by NIH (Grant Nos. R03-DC-008192 and R21-DC-011844 to X.L., Grant No. R03-DC-010064 to D.M.L., and Grant No. R01-DC-001526 to R.V.S.). We would also like to thank two anonymous reviewers for their constructive comments on an earlier version of the manuscript.

Article Outline

  1. INTRODUCTION
  2. METHODS
    1. Subjects
    2. Stimuli
      1. Place-pitch contours
      2. Temporal-pitch contours
    3. Procedures
  3. RESULTS
    1. PCI with place cues alone
    2. PCI with temporal cues alone
    3. PCI with combined place and temporal cues
      1. Δ F values at threshold combined with various Δ α
        1. Effects of rising or falling temporal-pitch cues.
        2. Effects of consistent or inconsistent temporal-pitch cues.
      2. Δ α values at threshold combined with various Δ F
        1. Effects of rising or falling place-pitch cues.
        2. Effects of consistent or inconsistent place-pitch cues.
  4. DISCUSSION

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KEYWORDS, PACS, and IPC

Keywords

cochlear implants, hearing

PACS

International Patent Classification (IPC)

  • A61F2/18

    Internal ear or nose parts, e.g. ear-drums

ARTICLE DATA

History
Received 30 Jan 2011
Accepted 06 Dec 2011
Revised 01 Dec 2011
Digital Object Identifier
http://dx.doi.org/10.1121/1.3672708

PUBLICATION DATA

ISSN

0001-4966 (print)  

Publisher

$abstract.society.value is a Member of CrossRef Acoustical Society of America

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