Speech signal presentation to the totally deaf

Area of Science:

• Otorhinolaryngology
• Biomedical Engineering
• Neuroscience

Background:

• The totally deaf population lacks auditory input, necessitating alternative sensory substitution methods.
• Conventional cochlear implants carry risks of intra cochlear damage.
• Existing auditory prostheses may not fully address the needs of all deaf individuals.

Purpose of the Study:

• To develop and evaluate a novel single-channel electrical stimulation system for the totally deaf.
• To assess the safety and efficacy of stimulating the cochlear promontory.
• To improve speech perception and production in deafened individuals through tailored electrical stimulation.

Main Methods:

• A removable electrode assembly was designed for direct stimulation of the cochlear promontory.
• Charge-balanced stimulation protocols were employed to deliver speech pattern elements.
• Patients' lipreading abilities and new sensory inputs were matched to stimulation parameters.
• Objective tests were conducted to evaluate improvements in perceptive and productive abilities.

Main Results:

• The system successfully provided single-channel electrical stimulation via a removable electrode.
• The minimally invasive approach reduced the risk of mechanical or electro-chemical cochlear damage.
• Objective assessments demonstrated significant improvements in patients' speech perceptive and productive skills.
• The stimulation effectively integrated with patients' lipreading capabilities.

Conclusions:

• Single-channel electrical stimulation of the cochlear promontory is a viable option for the totally deaf.
• This approach offers a safer alternative to intra cochlear devices, minimizing damage.
• The developed system enhances communication abilities by improving speech perception and production.