Disentangling verbal learning performance in multiple sclerosis: Dissociating strategy initiation and maintenance.

Area of Science:

• Neuroscience
• Cognitive Psychology
• Clinical Neurology

Background:

• Verbal learning performance in multiple sclerosis (MS) is influenced by executive functions, specifically strategy generation and maintenance.
• Understanding these distinct mechanisms is crucial for developing targeted cognitive rehabilitation strategies for individuals with MS.

Purpose of the Study:

• To deconstruct verbal learning performance in people with MS by analyzing strategy initiation and maintenance.
• To identify specific executive function deficits contributing to verbal learning impairments in MS.

Main Methods:

• Analysis of verbal learning data from 558 individuals with MS and 501 healthy controls.
• Calculation of initiation and cessation indices to quantify semantic strategy use.
• Application of regression analyses to map learning trajectories and identify factors influencing them.

Main Results:

• Individuals with MS were less likely to use semantic clustering and more prone to delayed strategy initiation and premature strategy abandonment.
• Distinct patterns emerged: Relapsing-remitting MS (RRMS) showed strategy decay, while progressive MS forms demonstrated primary strategy generation failure.
• Higher education levels correlated with better strategy initiation, supporting the cognitive reserve hypothesis.

Conclusions:

• Verbal learning deficits in MS are characterized by a dissociation between strategy acquisition and endurance.
• Cognitive rehabilitation interventions should be personalized, incorporating cognitive endurance training for early-stage MS and compensatory strategies for progressive forms.