Auditory and Audiovisual Close Shadowing in Post-Lingually Deaf Cochlear-Implanted Patients and Normal-Hearing...

Area of Science:

• Auditory Neuroscience
• Speech Perception
• Human Motor Control

Background:

• Auditory deprivation and age-related speech decline can impact perceptuo-motor abilities.
• Cochlear implantation aims to restore hearing but may affect speech processing.
• Understanding these effects is crucial for improving auditory rehabilitation.

Purpose of the Study:

• To investigate the influence of auditory deprivation and age on perceptuo-motor skills in speech processing.
• To compare cochlear-implanted (CI) patients with normal-hearing elderly (NHE) and young individuals.
• To examine the role of auditory and visual stimuli, and manual versus oral responses.

Main Methods:

• A close-shadowing experiment involving syllable categorization tasks.
• Participants included 10 CI patients, 10 NHE participants, and young normal-hearing controls.
• Data collected included reaction times and accuracy for auditory/audiovisual stimuli and manual/oral responses.

Main Results:

• CI participants were slower and less accurate than both young and elderly normal-hearing groups.
• Visual input improved CI performance, but not NHE performance.
• Oral responses were faster than manual responses across all groups.

Conclusions:

• Perceptuo-motor relationships remain functional in CI users and NHE individuals, despite performance differences.
• Oral responses are faster, supporting sensorimotor loop theories of speech perception.
• Implicit motor knowledge likely constrains auditory speech processing, with oral responses being quicker but manual responses more accurate.