An investigation of auditory processing in relapsing-remitting multiple sclerosis

Area of Science:

• Neuroscience
• Auditory Neuroscience
• Clinical Neurology

Background:

• Multiple sclerosis (MS) is a common neurological disorder impacting sensory processing, cognition, and mental health.
• Auditory processing deficits are prevalent in MS, yet neurophysiological measures like mismatch negativity (MMN) remain understudied.
• MMN reflects automatic auditory change detection, offering insights into early auditory cortex function.

Purpose of the Study:

• To investigate differences in MMN endpoints between individuals with relapsing-remitting MS and healthy controls.
• To explore the relationship between MS symptomatology (depression, fatigue) and MMN measures.
• To assess auditory cortex function in MS using a multi-feature MMN paradigm.

Main Methods:

• Electroencephalography (EEG) was used to measure MMN amplitudes and latencies.
• A multi-feature MMN paradigm with five distinct deviant tones was employed.
• Participants included individuals with relapsing-remitting MS and age-matched healthy controls.

Main Results:

• No significant differences in MMN amplitudes or latencies were observed between the MS and control groups.
• A significant correlation was found between reduced MMN amplitudes to intensity deviants and physician-reported MS disability.
• Effect sizes for MMN differences were small, indicating limited group-level divergence.

Conclusions:

• While overall MMN did not differ, intensity-based MMN may serve as a sensitive indicator of neurological deterioration in MS.
• Reduced MMN responses could potentially reflect MS disease severity.
• This study provides a detailed profile of auditory processing in MS, highlighting MMN's potential role in assessing disease progression.