Temporal Lobe Epilepsy Alters Auditory-motor Integration For Voice Control

Area of Science:

• Neuroscience
• Epilepsy Research
• Auditory-Motor Integration

Background:

• Temporal lobe epilepsy (TLE) is a common drug-resistant focal epilepsy in adults.
• Existing research indicates TLE patients have deficits in auditory processing and speech sound perception.
• The impact of TLE on auditory-motor integration specifically for voice control remains under-investigated.

Purpose of the Study:

• To investigate whether TLE affects auditory-motor integration essential for voice control.
• To compare vocal and neural responses to auditory pitch feedback errors between TLE patients and healthy controls.

Main Methods:

• Compared event-related potentials (ERPs) and vocal responses to pitch errors (1/2 or 2 semitones upward) in auditory feedback.
• Studied 28 patients with TLE and 28 age- and sex-matched healthy controls.
• Utilized graphical network analyses to assess neuronal network differences.

Main Results:

• Patients with TLE exhibited significantly larger vocal responses and smaller P2 ERP amplitudes compared to controls.
• TLE patients showed a positive correlation between vocal response magnitude and baseline voice variability.
• A negative correlation was found between P2 amplitude and disease duration in TLE patients.
• Network analyses revealed disrupted neuronal networks in TLE patients, with increased clustering coefficients and path lengths.

Conclusions:

• TLE is associated with atypical auditory-motor system integration for vocal pitch regulation.
• The functional neural networks processing auditory feedback of pitch errors differ significantly between TLE patients and healthy individuals.
• Findings highlight TLE's broader impact on sensorimotor control beyond auditory processing.