Baseline neuropsychological performance among the study groups. Data are presented in z‐scores for visualization purposes to standardize performance across all tests and present them on a common scale (error bars represent SD). Trail Making Test scores are shown inverted. CERAD, Consortium to Establish a Registry for Alzheimer's Disease; FCSRT, Free and Cued Selective Reminding Test; VOSP, Visual Object and Space Perception Battery.