Certain brain changes may help explain why many older adults become clumsier
as time goes by, a new study says.
Age-related declines in vision, agility and other physical abilities can lead
to an increase in problems such as knocking over a glass while reaching for the
salt shaker or fumbling while trying to slide a key into a lock.
But some of the increased clumsiness may be due to changes in the mental
frame of reference that older adults use to visualise nearby objects, say
researchers at Washington University in St Louis.
"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," study co-author Richard Abrams, a professor of
psychology in arts and sciences, said in a university news release.
"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," he explained.
The study, recently published in the journal Psychological Science,
included young and older adults who were given a series of simple tasks
involving hand movement. The young adults used an "action-centred" reference
frame when picking up an object. This means that they remained aware of and
sensitive to potential obstacles along their hand's path of movement.
But older adults used a "body-centred" reference frame, which means they
devoted more attention to objects that were closer to their bodies, whether or
not they were along their hand's path of movement. As a result, they were less
able to adjust their hand movements to avoid obstacles, the researchers
The US National Institute on Aging has more about health and aging.