title: Pointing to an allocentric and egocentric remembered target in younger and older adults.
abstract: Previous reports have shown that older adults have difficulties in maintaining allocentric information in memory but not egocentric information. The present study evaluated pointing accuracy in younger and older adults for egocentric and allocentric task. The task was to localize and maintain one, two, or four target locations. Target(s) were presented with or without a surrounding white square in a dimly lit environment. Despite previous postulations, the results of the present study revealed that older adults were able to point to remembered egocentric and allocentric targets as accurately as younger adults regardless of task difficulty. However, older adults took more time pointing to allocentric targets as compared to younger adults. The longer movement time was caused by a lengthening of the deceleration phase, suggesting that during pointing, older adults rely more on visual information surrounding the target than younger adults.
authors.affiliation: Motor Control Laboratory, Arizona State University, Tempe, Arizona 85287-0404, USA.
authors.forename: Martin
authors.initials: M
authors.lastname: Lemay
authors.forename: Christopher P
authors.initials: CP
authors.lastname: Bertram
authors.forename: George E
authors.initials: GE
authors.lastname: Stelmach
mesh_terms: D000054:Acceleration; D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology*; D003654:Deceleration; D005260:Female; D006801:Humans; D008297:Male; D008568:Memory / Q000502:physiology*; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010775:Photic Stimulation; D011597:Psychomotor Performance / Q000502:physiology; D011930:Reaction Time