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IntroductionGait disturbance is a hallmark of Parkinson's disease (PD) that worsens under complex conditions and might change according to environmental context. In this study, we aimed to determine how observing gait demands and context affects arousal and valence in PD.MethodsFifty PD participants and 50 healthy subjects (HS) completed a questionnaire evaluating arousal and valence of gait observation. This consisted of 36 videos showing a person walking, which were categorized based on two factors: (i) context: natural or built environment; and (ii) walking demand: Low-Demand (LD, e.g., usual walking along a street); Moderate-Demand (MD, e.g., walking on narrow surfaces); High-Demand (HD, e.g., walking on heightened surfaces).ResultsArousal scores increased significantly according to environmental context (natural > built environment) and task complexity (HD > MD > LD). Both groups reported a negative valence for demanding conditions, a positive valence for LD in natural environments, and a neutral valence for LD in built environments. When comparing PD and HS, valence attribution was similar, whereas PD participants reported higher arousal than controls.DiscussionThe overall higher arousal levels observed in PD patients compared with HS may reflect a heightened emotional reactivity to walking-related challenges. This study will enhance our understanding of gait-related difficulties in PD.
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