PET imaging of cochlear-implant and normal-hearing subjects listening to speech and nonspeech

Donald Wong, Richard Miyamoto, David Pisoni, Mark Sehgal, Gary Hutchins

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

Functional neuroimaging with positron emission tomography (PET) was used to compare the brain activation patterns of normal-hearing (NH) with postlingually deaf, cochlear-implant (CI) subjects listening to speech and nonspeech signals. The speech stimuli were derived from test batteries for assessing speech-perception performance of hearing-impaired subjects with different sensory aids. Subjects were scanned while passively listening to monaural (right ear) stimuli in five conditions: Silent Baseline, Word, Sentence, Time-reversed Sentence, and Multitalker Babble. Both groups showed bilateral activation in superior and middle temporal gyri to speech and backward speech. However, group differences were observed in the Sentence compared to Silence condition. CI subjects showed more activated loci in right temporal regions, where lateralized mechanisms for prosodic (pitch) processing have been well established; NH subjects showed a focus in the left inferior frontal gyrus (Brodmann's area 47), where semantic processing has been implicated. Multitalker Babble activated auditory temporal regions in the CI group only. Whereas NH listeners probably habituated to this multitalker babble, the CI listeners may be using a perceptual strategy that emphasizes 'coarse' coding to perceive this stimulus globally as speechlike. The group differences provide the first neuroimaging evidence suggesting that postlingually deaf CI and NH subjects may engage differing perceptual processing strategies under certain speech conditions.

Original languageEnglish
Pages (from-to)34-42
Number of pages9
JournalHearing Research
Volume132
Issue number1-2
DOIs
StatePublished - 1999

Fingerprint

Cochlear Implants
Positron-Emission Tomography
Hearing
Temporal Lobe
Sensory Aids
Speech Perception
Functional Neuroimaging
Prefrontal Cortex
Semantics
Neuroimaging
Ear
Brain

Keywords

  • Cochlear implant
  • Deaf
  • Imaging
  • Language
  • Positron emission tomography
  • Speech perception

ASJC Scopus subject areas

  • Sensory Systems

Cite this

PET imaging of cochlear-implant and normal-hearing subjects listening to speech and nonspeech. / Wong, Donald; Miyamoto, Richard; Pisoni, David; Sehgal, Mark; Hutchins, Gary.

In: Hearing Research, Vol. 132, No. 1-2, 1999, p. 34-42.

Research output: Contribution to journalArticle

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