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Older adult clumsiness linked to brain changes
Date:6/4/2013

For many older adults, the aging process seems to go hand-in-hand with an annoying increase in clumsiness difficulties dialing a phone, fumbling with keys in a lock or knocking over the occasional wine glass while reaching for a salt shaker.

While it's easy to see these failings as a normal consequence of age-related breakdowns in agility, vision and other physical abilities, new research from Washington University in St. Louis suggests that some of these day-to-day reaching-and-grasping difficulties may be be caused by changes in the mental frame of reference that older adults use to visualize nearby objects.

"Reference frames help determine what in our environment we will pay attention to and they can affect how we interact with objects, such as controls for a car or dishes on a table," said study co-author Richard Abrams, PhD, professor of psychology in Arts & Sciences.

"Our study shows that in addition to physical and perceptual changes, difficulties in interaction may also be caused by changes in how older adults mentally represent the objects near them."

Published in the journal Psychological Science, the study is co-authored by two recent graduates of the psychology graduate program at Washington University. The lead author, Emily K. Bloesch, PhD, is now a postdoctoral teaching associate at Central Michigan University. The third co-author, Christopher C. Davoli, PhD, is a postdoctoral psychology researcher at the University of Notre Dame.

When tested on a series of simple tasks involving hand movements, young people in this study adopted an attentional reference frame centered on the hand, while older study participants adopted a reference frame centered on the body.

Young adults, the researchers explain, have been shown to use an "action-centered" reference frame that is sensitive to the movements they are making. So, when young people move their hands to pick up an object, they remain awar
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Contact: Gerry Everding
gerry_everding@wustl.edu
314-935-6375
Washington University in St. Louis
Source:Eurekalert

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