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Cross-sectional and longitudinal relationships among age, cognition, and processing speed
1Rose F. Kennedy Center for Mental Retardation and Human Development, Department of Neurology, Albert Einstein College of Medicine, Bronx, New York 10461, USA. sliwinsk@aecom.yu.edu
Psychology and Aging
|May 4, 1999
Summary
Processing speed impacts cognitive function in older adults. While it explains cross-sectional age differences, it doesn't fully account for long-term cognitive decline over time.
Area of Science:
- Gerontology
- Cognitive Neuroscience
- Psychology
Background:
- Cognitive aging research often examines cross-sectional and longitudinal effects.
- Understanding factors influencing cognitive decline in older adults is crucial.
Purpose of the Study:
- To investigate the relationship between processing speed and cognitive function in older adults.
- To differentiate the roles of processing speed in cross-sectional versus longitudinal aging effects.
Main Methods:
- Longitudinal study of 302 older adults.
- Assessment of cognitive function and processing speed over time.
- Statistical analyses controlling for processing speed.
Main Results:
- Processing speed was associated with cognitive performance at a single time point.
- Changes in processing speed predicted individual cognitive decline over time.
- Controlling for processing speed reduced cross-sectional age effects but not longitudinal aging effects.
Conclusions:
- Processing speed is a significant correlate of cognitive status in older adults.
- Processing speed's influence differs between cross-sectional and longitudinal aging.
- Further research is needed on methodological aspects of cognitive aging studies.