Hafif Bilişsel Bozukluk Fenotipleri Arasında Bilişsel Rezervin Potansiyel Olarak Değiştirilebilir Geç Ömürlü Korrelat Olarak Sosyal İşlev

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Abstract Objective Cognitive decline is common in neurodegenerative diseases and affects quality of life. Cognitive reserve (CR) may mitigate cognitive deterioration, but traditional proxies, such as education and occupation, may not fully capture late-life sources of reserve. This study examined whether social function explains cognition beyond traditional CR proxies and whether these associations differ across neurodegenerative conditions. Methods A total of 617 participants were enrolled: 315 normal controls, 84 individuals with neuropsychologically defined AD-like mild cognitive impairment (AD-like MCI), 122 patients with Parkinson’s Disease (PD) with normal cognition (PD-NC), and 96 PD patients with MCI (PD-MCI). Social function was assessed using the Geriatric Social Function Scale (GSFS), including Daily Function, Interpersonal Function, and Social Participation. Global and domain-specific cognition were evaluated with a neuropsychological battery. Group differences, hierarchical regression, and moderation analyses were conducted. Results Social function was positively associated with global cognition and explained additional variance beyond traditional CR proxies ( ΔR² = 0.04, p  β  = 0.18, p  

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