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Spatial navigation in elderly healthy subjects, amnestic and non amnestic MCI patients
Maria Luisa Rusconi1, Angelo Suardi1, Marina Zanetti2
1Department of Human and Social Sciences, University of Bergamo, Italy.
Introduction:
Mild cognitive impairment (MCI) is considered an early stage of cognitive impairment. Therefore, it is important to identify early cognitive markers of MCI conversion to dementia and topographical disorientation (TD) may help differentiate normal aging from MCI and prodromal Alzheimer's disease (AD). Our aim was to propose a new instrument in elderly healthy subjects and MCI patients of amnestic (aMCI) and non-amnestic (naMCI) type.
Method:
We observed 18 healthy subjects and 18 MCI patients (9 aMCI and 9 naMCI). All participants were submitted to a neuropsychological battery and to a new experimental small-scale spatial navigation test reproducing an ideal city.
Results:
a-MCI patients performed worse in learning a new route, in replacing landmarks in the city and in drawing a map of the city. Na-MCI patients' performance was not different from that observed in healthy subjects, except for a longer time span in Route Forward learning. MCI and healthy samples showed different correlations between experimental subtests and neuropsychological tests.
Conclusions:
Our task seems to be sensitive in pointing out differences in spatial abilities of MCI subtypes, especially with regard to the following subtests: learning a new route, retrieving a landmark's place and building a map of the environment. In comparison with more complex tests, these results allow us to consider the new tool as useful to evaluate spatial navigation in healthy elderly subjects and MCI patients.
Insights
A new spatial navigation test effectively identifies differences in mild cognitive impairment (MCI) subtypes, particularly amnestic MCI. This tool aids in distinguishing MCI from normal aging and supports early detection of cognitive decline.
Area of Science:
- Neuroscience
- Gerontology
- Cognitive Psychology
Background:
- Mild cognitive impairment (MCI) represents an early stage of cognitive decline.
- Identifying early markers for MCI conversion to dementia is crucial.
- Topographical disorientation (TD) may help differentiate normal aging from MCI and prodromal Alzheimer's disease (AD).
Purpose of the Study:
- To propose and validate a novel spatial navigation instrument.
- To assess elderly healthy subjects and patients with amnestic (aMCI) and non-amnestic (naMCI) subtypes of MCI.
Main Methods:
- A cohort of 18 healthy subjects and 18 MCI patients (9 aMCI, 9 naMCI) was studied.
- Participants underwent a neuropsychological battery.
- A new experimental small-scale spatial navigation test using an ideal city model was administered.
Main Results:
- Amnestic MCI patients showed deficits in learning new routes, landmark recall, and map drawing.
- Non-amnestic MCI patients exhibited only a slight delay in Route Forward learning compared to controls.
- Distinct correlations between experimental subtests and neuropsychological measures were observed in MCI and healthy groups.
Conclusions:
- The developed spatial navigation task is sensitive to spatial ability differences in MCI subtypes.
- Subtests involving route learning, landmark retrieval, and map construction are particularly informative.
- This tool shows promise for evaluating spatial navigation in healthy elderly individuals and MCI patients, offering a less complex alternative to existing methods.
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