Preserved motor asymmetry in late adulthood: is measuring chronological age enough?

Neuroscience
Sydney Y Schaefer

Abstract

When comparing motor performance of the dominant and nondominant hands, older adults tend to be less asymmetric compared to young adults. This has suggested decreased motor lateralization and functional compensation within the aging brain. The current study further addressed this question by testing whether motor asymmetry was reduced in a sample of 44 healthy right-handed adults ages 65-89. We hypothesized that the older the age, the less the motor asymmetry, and that 'old old' participants (age 80+) would have less motor asymmetry than 'young old' participants (age 65-79). Using two naturalistic tasks that selectively biased the dominant or nondominant hands, we compared asymmetries in performance (measured as a ratio) across chronological age. Results showed preserved motor asymmetry across ages in both tasks, with no difference in asymmetry ratios in the 'old old' compared to the 'young old.' In the context of previous work, our findings suggest that the aging brain may also be characterized by additional measures besides chronological age.

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Citations

Feb 16, 2016·Human Brain Mapping·Jill Campbell StewartSteven C Cramer
Oct 7, 2015·Experimental Brain Research·S Y Schaefer, C R Hengge
Dec 8, 2015·Human Movement Science·Robert L McGrath, Shailesh S Kantak
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Apr 21, 2018·Laterality·Paula Cristina Dos Santos RodriguesMaria Olga Fernandes Vasconcelos
Sep 15, 2019·Aging Clinical and Experimental Research·Jennapher Lingo VanGilderSydney Y Schaefer
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Feb 18, 2017·Experimental Brain Research·Philipp Gulde, Joachim Hermsdörfer
Feb 27, 2021·Developmental Psychobiology·Sara M Scharoun BensonPamela J Bryden
Nov 21, 2017·Neuroscience Letters·Jennapher Lingo VanGilderSydney Y Schaefer
May 16, 2021·Motor Control·Geneviève N OlivierSydney Y Schaefer
Apr 1, 2020·Journal of Motor Learning and Development·Peiyuan WangSydney Y Schaefer

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