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The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
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Real-Ear-to-Coupler Difference: Physical and Perceptual Differences.

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Measuring real-ear-to-coupler difference (RECD) for hearing aid fittings in older adults improved patient satisfaction and reduced hearing handicap compared to using average values. Personalized RECD measurements enhance hearing aid outcomes.

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Area of Science:

  • Audiology
  • Hearing Science
  • Biomedical Engineering

Background:

  • Real-ear-to-coupler difference (RECD) is crucial for pediatric hearing aid fitting.
  • Its necessity for adult hearing aid fitting remains debated among clinicians.

Purpose of the Study:

  • To investigate the necessity and impact of measured RECD versus average RECD values in fitting hearing aids for older adults.
  • To assess the effect of personalized RECD measurements on hearing aid satisfaction and perceived hearing handicap.

Main Methods:

  • Two groups of 85 older adults received hearing aid fittings.
  • One group used measured RECD values; the other used population-based average RECD values.
  • Pure-tone hearing thresholds were similar between groups.

Main Results:

  • Measured RECDs showed minimal ear-to-ear difference, but ~20% fell outside the typical range.
  • All participants reported reduced self-perceived hearing handicap (HHIE-S scores).
  • Measured RECD group had significantly lower postfitting HHIE-S scores and higher satisfaction (IOI-HA).

Conclusions:

  • Personalized RECD measurements, alongside real-ear verification, improve hearing aid fitting accuracy.
  • Using measured RECD values enhances hearing aid satisfaction in older adults.
  • Accurate dB HL to dB SPL conversion via personalized RECD is key to better outcomes.