Association of Longitudinal Cognitive Decline With Amyloid Burden in Middle-aged and Older Adults

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Abstract
The advent of in vivo amyloid imaging has resulted in a corpus of cross-sectional data that indicate that cognitively normal older adults vary considerably in their magnitude of amyloid deposition. Those in the higher range of amyloid burden often demonstrate deficits in episodic memory,1-5 a hallmark of Alzheimer disease (AD), and other domains of cognition.4,6-9 Contemporary models of AD posit that healthy individuals harboring elevated amyloid pathology are in a preclinical stage of AD and on a trajectory toward developing dementia.10,11