The Electrically Evoked Auditory Change Complex Evoked by Temporal Gaps Using Cochlear Implants or Auditory Brainstem...

Area of Science:

• Auditory Neuroscience
• Neuroprosthetics
• Pediatric Audiology

Background:

• Cochlear nerve deficiency (CND) presents unique challenges for auditory rehabilitation.
• Auditory brainstem implants (ABIs) and cochlear implants (CIs) are used to restore hearing in individuals with CND.
• Understanding temporal processing is crucial for speech perception.

Purpose of the Study:

• To assess the feasibility of measuring the electrically evoked auditory change complex (eACC) in response to temporal gaps in children with CND using ABIs and/or CIs.
• To investigate the relationship between neural encoding and perceptual sensitivity to temporal gaps in these children.

Main Methods:

• Electrically evoked auditory change complexes (eACCs) and objective gap detection thresholds (GDTs) were measured in 5 children with CND using ABIs and/or CIs.
• Behavioral GDTs were assessed using a psychophysical task.
• Stimulation was delivered via individual ABI or CI electrodes.

Main Results:

• eACCs were successfully recorded in all subjects for at least one electrode.
• Objective and behavioral GDTs exhibited significant inter- and intra-subject variability.
• Electrode-specific comparisons revealed inconsistencies between eACC measures and behavioral GDTs in some cases.

Conclusions:

• Measuring eACCs in response to temporal gaps is feasible in children with CND using ABIs or CIs.
• Temporal gap processing shows considerable variability across individuals and stimulation sites.
• The correlation between neural and perceptual measures of temporal gap detection is electrode-dependent.