SNCA and Cognitive impairment: In 31 individuals (26 AD dementia/5 mild cognitive impairment, mean age = 80 years, 26% females), antemortem typicality was significantly negatively associated with neuropathologic features, including β-amyloid (rho = −0.39 overall), tau (rho = −0.38 regionally), alpha-synuclein (rho = −0.39 regionally), TDP-43 (rho = −0.49 overall), and concomitance of pathologies (rho = −0.59 regionally).