GFAP and Parkinson disease: Other studies have also investigated the association of GFAP and NfL with cognition, albeit predominantly with screening tools of global cognition (e.g., Mini‐Mental State Examination [MMSE], MoCA), and have found elevated GFAP to be associated with worse baseline cognition or cognitive decline in AD/MCI,10, 47 PD or other synucleinopathies,38 or FTD,37, 48 while others did not.10, 49