Spatial memory assessment reveals age-related differences in egocentric and allocentric memory performance.

Humans move through the environment to reach a place mainly using two strategies: egocentric, taking the viewer's position as a point of reference, and allocentric, employing external landmarks in order to create a mental map of the environment. Aging seems to be associated with a deterioration in these functions, and although participants are evaluated with both virtual and real-environment tasks, performance on these two strategies is not frequently compared. Our objective was to evaluate egocentric and allocentric spatial memory in young and older adult populations using three tasks performed in real environments that allow the perception of 3-D information present in our daily orientation and make it possible to analyse each strategy separately. Twenty-eight young adults and 27 older adults performed Egocentric and Allocentric Spatial Memory Tasks, the Spatial Span task from CANTAB to assess visuospatial span and visuospatial working memory, and Benton's Judge of Line Orientation Test to measure the ability to establish judgments of spatial relations. Young adults outperformed older adults on spatial memory tasks. The older group improved across allocentric blocks. Young men outperformed older men on both the egocentric and allocentric tasks, whereas young women only achieved better scores than older women on the allocentric task. Our findings support the existence of age-related differences in spatial memory performance.