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Sequential stream segregation in normally-hearing and cochlear-implant listeners.

Viral D Tejani1, Kara C Schvartz-Leyzac1, Monita Chatterjee1

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Summary

Cochlear implant (CI) listeners showed poorer stream segregation than normal hearing (NH) listeners with pure tones. However, direct electrical stimulation revealed NH-like stream segregation, suggesting CI processors may degrade acoustic cues.

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Speech Processing

Background:

  • Sequential stream segregation is crucial for auditory perception.
  • Normal hearing (NH) listeners' stream segregation abilities are well-established.
  • Cochlear implant (CI) listeners face challenges in auditory processing due to device limitations.

Purpose of the Study:

  • To investigate sequential stream segregation in NH and CI listeners using an irregular rhythm detection (IRD) task.
  • To compare stream segregation performance between NH and CI listeners across different stimulus conditions.
  • To explore the role of acoustic cues and electrical stimulation in CI listeners' stream segregation.

Main Methods:

  • Participants included younger/older NH listeners and CI users.
  • Stimuli included pure tones and narrowband noises presented via headphones or direct electrical stimulation.
  • An irregular rhythm detection (IRD) task was employed to assess stream segregation.

Main Results:

  • NH listeners' stream segregation was unaffected by aging or tonal pitch.
  • CI listeners performed worse than NH listeners with pure tone stimuli.
  • Direct electrical stimulation improved CI listeners' stream segregation, approaching NH performance levels.
  • CI speech processors may degrade acoustic cues essential for stream segregation.

Conclusions:

  • Tonal pitch and age do not significantly impact NH listeners' stream segregation.
  • CI listeners exhibit impaired stream segregation compared to NH listeners with acoustic stimuli.
  • Direct electrical stimulation in CI users can reveal underlying stream segregation capabilities, suggesting processor-induced cue degradation.