Objective Assessment of Cognition for Detecting Subjective Cognitive Decline Is More Accurate than Subjective Estimations: The Role of Trait Affect.

The early identification of cognitive decline is crucial for well-timed intervention and diagnosis, particularly in the context of preclinical Alzheimer's disease (AD). In this study, we investigated the complex interplay between trait affect, objective cognitive performance, and subjective memory estimations in a sample of 105 older adults. Using path analysis, we aimed to determine whether trait affect and objective cognitive control abilities predict individuals' subjective perceptions of their own memory abilities. The results revealed that both positive and negative trait affect significantly predicted subjective memory estimations, while objective cognitive control performance did not significantly predict these estimations. These findings highlight a crucial dissociation between objective and subjective cognitive measures. Therefore, the present results underscore the critical importance of complementing self-reported cognitive estimations, which can be biased by stable emotional dispositions, with objective cognitive tools like the R4Alz-pc (preclinical) index. This approach enables a more accurate evaluation of cognitive health in advancing age, especially for the early detection of subtle dysfunction in preclinical AD.