The ability to examine within-person change is essential to test process-based theories in
sport and exercise psychology. Longitudinal data, whether experimental or observational …

The study of intraindividual variability is the study of fluctuations, oscillations, adaptations,
and “noise” in behavioral outcomes that manifest on microtime scales. This article provides a …

Replication of research findings across independent longitudinal studies is essential for a
cumulative and innovative developmental science. Meta-analysis of longitudinal studies is …

Objectives. Chronological age is the most frequently employed predictor in life-span
developmental research, despite repeated assertions that it is best conceived as a proxy for …

One of the major theoretic frameworks through which human development is studied is a
process-oriented model involving selection, optimization, and compensation. These three …

In this study, the authors addressed the longitudinal nature of intraindividual variability over
3 years. A sample of 304 community-dwelling older adults, initially between the ages of 64 …

The study of aging demands an integrative life-span developmental framework, involving
interdisciplinary collaborations and multiple methodological approaches for understanding …

Objectives: This study examined the relationship between body mass index (BMI) and
trajectories of cognitive decline among older Korean adults. Methods: Participants were a …

Perceived control plays an important role for remaining cognitively fit across adulthood and
old age. However, much less is known about the role of perceived control over and above …

Objectives. Relative to typical age-related cognitive decrements, the terms “terminal decline”
and “terminal drop” refer to the phenomenon of increased cognitive decline in proximity to …