Electric-acoustic stimulation in adults: localization and speech perception

Area of Science:

• Audiology
• Neuroscience
• Biomedical Engineering

Background:

• Electric-acoustic stimulation (EAS) combines electrical stimulation for high frequencies with acoustic amplification for low frequencies.
• Binaural hearing, using both ears, is crucial for sound localization and speech understanding.
• Optimizing device settings is essential for maximizing benefits in hearing-impaired individuals.

Purpose of the Study:

• To investigate optimal prescription strategies for electric-acoustic stimulation (EAS) devices.
• To evaluate sound localization and speech perception in adults using unilateral EAS and contralateral acoustic amplification.
• To determine the best device settings for improved auditory outcomes.

Main Methods:

• Assessed sound localization and speech perception in adults with unilateral EAS and contralateral acoustic amplification.
• Systematically adjusted relative output levels and cross-over frequencies of EAS devices.
• Conducted a case study to validate optimized settings in a real-world scenario.

Main Results:

• Bilateral acoustic amplification demonstrated localization benefits compared to unilateral EAS.
• Optimized acoustic-to-electric levels and cross-over frequencies led to significant improvements.
• The case study confirmed enhanced localization and speech perception with optimized unilateral EAS and contralateral hearing aid use.

Conclusions:

• Optimized prescription of EAS devices, particularly when combined with contralateral hearing aids, can significantly improve sound localization and speech perception.
• Fine-tuning acoustic-to-electric levels and cross-over frequencies is critical for maximizing functional benefits.
• This research provides valuable insights for audiologists and clinicians prescribing EAS devices.