Cross-sectional and longitudinal relationships among age, cognition, and processing speed |
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Authors: | Sliwinski M Buschke H |
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Institution: | Rose 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 |
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Abstract: | Cross-sectional and longitudinal age effects on cognitive function were examined in 302 older adults followed longitudinally. Processing speed was related to cognitive performance at cross-section, and change in speed predicted within-person longitudinal cognitive decline. Statistical control of processing speed greatly reduced cross-sectional age effects but did not attenuate longitudinal aging effects. This difference in processing speed's ability to account for cross-sectional and longitudinal age effects is discussed in the context of theories of cognitive aging and methodological and statistical issues pertaining to the cross-sectional and longitudinal study of cognitive aging. |
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