Fig. 1

A flow chart of participant selection and categorization. The graphic shows the steps to select the participants finally included in the three groups of interest of the present study—the healthy controls and the cognitively unimpaired older adults with subjective cognitive decline (SCD) who referred (SCD-clinic) or not (SCD-community) to a memory clinic. All participants were selected from the Imagerie Multimodale de la maladie d’Alzheimer à un stade Précoce (IMAP+) study. N, sample size