MAPT and Alzheimer disease: Literature has not reached unequivocal consensus on whether Alzheimer’s disease memory deficits are due to encoding or retrieval.97,108-110 While we cannot unravel memory processes at play based on tau PET retention since it is not functionally associated with performance, it may be speculated that, at least at early stages where only delayed recall is altered, Alzheimer’s disease tauopathy is primarily threatening to retrieval processes.