MAPT and tauopathy: We measured CSF Aβ42/Aβ40 ratio, tau protein phosphorylated at threonine 181 (p-tau) and t-tau as markers of amyloidosis (A), tauopathy (T) and neurodegeneration (N) respectively, in a cohort of PD (cognitively unimpaired, PD-MCI and PDD), DLB patients and neurological controls (CTRL).