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Age differences in neural correlates of route encoding and route recognition
Olga Meulenbroek1, Karl Magnus Petersson, Nicol Voermans
1Cognitive Neurology and Memory Research Group, F.C. Donders Center for Cognitive Neuroimaging, University of Nijmegen, Nijmegen, The Netherlands.
Neuroimage
|July 28, 2004
Summary
Aging impairs spatial memory, particularly during route encoding, due to reduced brain activity in visual processing areas and less inhibition of irrelevant information. Route recognition differences between age groups were subtle.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Gerontology
Background:
- Spatial memory decline is a common aspect of aging.
- The precise neural mechanisms underlying these age-related spatial memory deficits remain unclear.
Purpose of the Study:
- To investigate the neural differences in spatial memory between young and old adults using functional MRI.
- To explore the brain activity during route encoding and route recognition tasks.
Main Methods:
- Functional MRI (fMRI) was used to scan 20 healthy young and 20 healthy old adults.
- Participants completed a navigational memory task involving route encoding and route recognition.
- Random effects analysis was employed to compare brain activity between the age groups.
Main Results:
- Older adults exhibited slightly poorer performance on the spatial memory task.
- Both groups showed activation in visual processing streams and frontal eye fields during encoding and recognition.
- Younger adults displayed stronger activation in dorsal/ventral visual streams during encoding and reduced anterior parahippocampal activity during recognition.
- Older adults showed less suppression in the perisylvian region and anterior cingulate cortex during encoding.
Conclusions:
- Age-related navigational memory deficits may stem from less effective route encoding, linked to reduced posterior visual stream and parietal function, and impaired inhibition of irrelevant information.
- Neural differences in route recognition appear less pronounced, possibly involving diminished familiarity signals in the anterior parahippocampal region in older adults.