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Semanticized autobiographical memory and the default – executive coupling hypothesis of aging

Semanticized autobiographical memory and the default – executive coupling hypothesis of aging

Published in: Neuropsychologia, Volume 110, February 2018, 37-43

Abstract
“As we age, the architecture of cognition undergoes a fundamental transition. Fluid intellectual abilities decline while crystalized abilities remain stable or increase. This shift has a profound impact across myriad cognitive and functional domains, yet the neural mechanisms remain under-specified. We have proposed that greater connectivity between the default network and executive control regions in lateral prefrontal cortex may underlie this shift, as older adults increasingly rely upon accumulated knowledge to support goal-directed behavior. Here we provide direct evidence for this mechanism within the domain of autobiographical memory. In a large sample of healthy adult participants (n = 103 Young; n = 80 Old) the strength of default – executive coupling reliably predicted more semanticized, or knowledge-based, recollection of autobiographical memories in the older adult cohort. The findings are consistent with the default – executive coupling hypothesis of aging and identify this shift in network dynamics as a candidate neural mechanism associated with crystalized cognition in later life that may signal adaptive capacity in the context of declining fluid cognitive abilities.”

Written by: R. Nathan Spreng, Amber W. Lockrow, Elizabeth DuPre, Roni Setton, Karen A.P. Spreng, Gary R. Turner
For full text: https://doi.org/10.1016/j.neuropsychologia.2017.06.009

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