MAPT and Alzheimer disease: Reference CSF values, obtained from the Neurochemical Laboratory at the University of Göttingen, include: tau (<450 pg/mL), phospho‐tau (<61 pg/mL), amyloid 1–42 (>450 pg/mL), amyloid ß1–42/40 ratio (>0.5); For Boston Naming test: n = 28/33 subjects—Data missing for 3 AD patients due to organizational reasons, and exclusion of 2 FTD patients due to difficulty understanding test instructions; For the Word List Learning Task: n = 27/33 subjects—Data missing for 3 AD patients due to organizational reasons and exclusion of 3 FTD patients due to difficulty understanding test instructions.