Memory-guided force control in healthy younger and older adults

Experimental Brain Research
Kristina A NeelyNancy A Dennis

Abstract

Successful performance of a memory-guided motor task requires participants to store and then recall an accurate representation of the motor goal. Further, participants must monitor motor output to make adjustments in the absence of visual feedback. The goal of this study was to examine memory-guided grip force in healthy younger and older adults and compare it to performance on behavioral tasks of working memory. Previous work demonstrates that healthy adults decrease force output as a function of time when visual feedback is not available. We hypothesized that older adults would decrease force output at a faster rate than younger adults, due to age-related deficits in working memory. Two groups of participants, younger adults (YA: N = 32, mean age 21.5 years) and older adults (OA: N = 33, mean age 69.3 years), completed four 20-s trials of isometric force with their index finger and thumb, equal to 25% of their maximum voluntary contraction. In the full-vision condition, visual feedback was available for the duration of the trial. In the no vision condition, visual feedback was removed for the last 12 s of each trial. Participants were asked to maintain constant force output in the absence of visual feedback. Participants also...Continue Reading

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Citations

Dec 27, 2019·Neuropsychology, Development, and Cognition. Section B, Aging, Neuropsychology and Cognition·Courtney R GerverNancy A Dennis
Jul 24, 2020·Journal of Aging and Physical Activity·Ing-Shiou HwangYi-Ching Chen
Aug 10, 2019·Psychonomic Bulletin & Review·Stephen RhodesMoshe Naveh-Benjamin

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