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Experimental Aging Research
An International Journal Devoted to the Scientific Study of the Aging Process
Volume 33, 2007 - Issue 4
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Original Articles

Are Visual Feedback Delays Responsible for Aging-Related Increases in Force Variability?

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Pages 399-415 | Received 11 Apr 2005, Accepted 10 Jul 2006, Published online: 14 Sep 2007
 

Abstract

The current investigation examined if age-related differences in the control of isometric force production are related to an increase in visual motor processing time. Young and old adults produced isometric force production to a visually displayed target while visual feedback delay was manipulated over a broad range (50 to 3200 ms). The force output of the oldest age group was more variable across the range of delays, but only demonstrated enhanced time dependent structure at short delays. It is concluded that age differences in visual motor processing time contribute to decrements in both the feedback and feedforward control of force output.

The study was supported in part by grants from the National Institute on Aging (T32-AG00048; 1 R03 AG023259). JJS was supported by a Kligman Research Fellowship.

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