Prior to the MEG recordings, all participants were screened with the Mini International Neuropsychiatric Interview (M.I.N.I.48). Handedness was assessed using the Edinburgh Handedness Inventory49. Cognitive performance was assessed using with a variety of tests (for a complete description see1830) for a total duration of approximately 2 hours. In the current study we used Trail Making Test A (TMT-A; range, 0–180 seconds) and B (TMT-B; range, 0–300 seconds) from the Consortium to Establish a Registry for Alzheimer's Disease (CERAD)-NP-plus neuropsychological test battery50.
