Old age impairs the use of arbitrary visual cues for predictive control of fingertip forces during grasp

Experimental Brain Research
Kelly J Cole, Diane L Rotella

Abstract

Old age impairs the ability to form new associations for declarative memory, but the ability to acquire and retain procedural memories remains relatively intact. Thus, it is unclear whether old age affects the ability to learn the visuomotor associations needed to set efficient fingertip forces for handling familiar objects. We studied the ability for human subjects to use visual cues (color) about the mechanical properties (texture or weight) of a grasped object to control fingertip forces during prehension. Old and young adults (mean age 77 years and 22 years, respectively) grasped and lifted an object that varied in texture at the gripped surfaces (experiment 1: sandpaper versus acetate surface materials) or weight (experiment 2: 200 g versus 400 g). The object was color-coded according to the mechanical property in the "visual cue" condition, and the mechanical property varied unpredictably across lifts in the "no visual cue" condition. In experiment 1 (texture), the young adults' grip force (force normal to the gripped surface) when the object lifted from the support surface was 24% smaller when the surfaces were color-coded. The old adults' grip force did not vary between the visual conditions despite their accurate repor...Continue Reading

Citations

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