Impaired information processing speed and attention allocation in multiple sclerosis patients versus controls: a...

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Clinical Neurophysiology

Background:

• The P3a event-related potential (ERP) reflects information processing speed and attention.
• Multiple Sclerosis (MS) is a demyelinating disease affecting the central nervous system.
• Understanding cognitive deficits in MS is crucial for patient management.

Purpose of the Study:

• To compare P3a ERP components (latency, amplitude, topography) between MS patients and controls.
• To correlate P3a ERP findings with performance on the Paced Auditory Serial Addition Test (PASAT).
• To investigate differences between relapsing-remitting MS (RRMS) and secondary progressive MS (SPMS) patients.

Main Methods:

• Seventy-four participants (20 RRMS, 20 SPMS, 34 controls) underwent visual and auditory oddball tasks.
• Electroencephalography (EEG) data were recorded from 134 channels.
• Statistical analyses included ANCOVA for latency and statistical parametric mapping for topography.

Main Results:

• MS patients exhibited altered visual P3a latency, amplitude, and topography compared to controls.
• Visual P3a amplitude correlated with PASAT scores in MS patients.
• Auditory P3a showed latency differences in MS patients over the parietal region.

Conclusions:

• Information processing speed and attention allocation are impaired in individuals with MS.
• P3a ERP measures are sensitive to cognitive deficits in MS.
• Distinct patterns of P3a alterations were observed between RRMS and SPMS subtypes.