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Related Experiment Videos

Speech perception by congenitally deaf subjects using an electrocutaneous vocoder.

M P Lynch1, R E Eilers, D K Oller

  • 1Department of Psychology, University of Miami, Florida 33101.

Journal of Rehabilitation Research and Development
|January 1, 1988
PubMed
Summary

Adults with profound deafness learned to identify words using an electrocutaneous vocoder. Combining this tactile input with aided-hearing significantly improved word recognition, especially for new vocabulary.

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Area of Science:

  • Neuroscience
  • Audiology
  • Biomedical Engineering

Background:

  • Profoundly deaf individuals often have limited access to auditory information.
  • Electrocautaneous vocoders offer a potential pathway for sensory substitution in hearing restoration.
  • Understanding tactile perception strategies is crucial for optimizing artificial hearing devices.

Observation:

  • Two congenitally deaf adults trained on an electrocutaneous vocoder (Tacticon 1600) achieved 41.6% word identification success.
  • Consistent error patterns indicated reliance on general tactile features like syllable count and movement direction.
  • Subjects utilized specific tactile cues such as locus, movement, and burst positions for word identification.

Findings:

  • Integrating tactile vocoder input with aided-audition (TV + A) significantly enhanced word identification by 93% (Subject One) and 56% (Subject Two) compared to aided-audition alone.

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  • Novel vocabulary, not previously encountered via the vocoder, was identified 78% (Subject One) and 50% (Subject Two) more accurately with combined sensory modalities.
  • Subjects demonstrated better-than-chance identification of novel vocabulary using the tactile vocoder alone.

    • Implications:

    • Sensory substitution via electrocutaneous vocoders can effectively supplement residual hearing.
    • Combining tactile and auditory information processing offers a promising strategy for improving speech perception in deaf individuals.
    • Further research into tactile cue utilization can refine the design and efficacy of artificial hearing prostheses.