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Contralateral Routing of Signal Devices Reduce Objective and Subjective Listening Effort in Unilateral Cochlear

Sara Neumann1, Sabrina Calise1, Bob Dwyer2

  • 1Hearts for Hearing, Oklahoma City, Oklahoma.

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|December 26, 2025
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Summary

A contralateral routing of signal (CROS) device significantly reduced listening effort and improved speech recognition for unilateral cochlear implant (CI) recipients. This technology enhances auditory performance, especially when sound is directed to the non-implanted ear.

Keywords:
AsymmetricCROSCochlear implantHearing lossListening effort

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Area of Science:

  • Audiology
  • Speech-Language Pathology
  • Hearing Aid Technology

Background:

  • Unilateral cochlear implant (CI) recipients often experience challenges with sound localization and speech understanding in noisy environments.
  • Contralateral routing of signal (CROS) devices are designed to address hearing loss in one ear by transmitting sound to the opposite side.

Purpose of the Study:

  • To evaluate the impact of a CROS device on listening effort and speech recognition in individuals with unilateral CI.
  • To assess both subjective and objective measures of listening effort and speech perception.

Main Methods:

  • A prospective, repeated measures study involving 15 adult unilateral CI recipients.
  • Participants were tested with and without a CROS device across various talker locations and signal-to-noise ratios.
  • Objective listening effort was measured by verbal response time, and subjective effort/motivation via questionnaires.

Main Results:

  • The CROS device demonstrated a reduction in both objective and subjective listening effort.
  • Speech recognition was significantly improved with the CROS device, particularly when speech stimuli were presented to the non-CI ear.
  • Participants reported improved motivation in specific listening conditions.

Conclusions:

  • CROS devices can effectively reduce listening effort and enhance speech recognition for unilateral CI users.
  • The findings suggest that CROS technology is a valuable tool for improving auditory function and quality of life in this population.
  • The benefits are most pronounced in situations where sound is directed towards the unaided ear.