IRCT20240111060675N2 IRCT 2026-10-18 Ahvaz University of Medical Sciences Investigating the effects of mental fatigue on cognitive-motor interference during walking in people with multiple sclerosis and healthy Investigating the effects of mental fatigue on cognitive-motor interference during walking in people with multiple sclerosis and healthy 2026-10-19 anticipated 60 Recruiting https://irct.ir/trial/92884 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Health service research, Randomization description: Eligible participants in each group of healthy and MS will be assigned 1:1 to either the mental fatigue or control groups using a computerized block randomization method. Randomization will be performed using alternating blocks of variable size to maintain balanced allocation. The randomization sequence will be performed by an independent investigator who is not involved in the current research project. The groups will then be concealed by opaque envelopes, Blinding description: This study is double-blind. As such, the participants and outcome assessors will not be aware of the type of grouping (mental fatigue group or control group) in people with MS and healthy. N/A MS. Intervention 1: Intervention group: mental fatigue protocol: In this study, mental fatigue will be induced using a modified version of the 100% incongruent visual Stroop task (color-word). Intervention 2: Control group: In this group, participants will choose their favorite film from the 3 suggested documentaries. No - There is not a plan to make this available Justification or reason for not sharing IPD is According to the research team's decision, there are no plans to publish it.