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Published on: April 24, 2009
Spatial navigation deficit in amnestic mild cognitive impairment
Jakub Hort1, Jan Laczó, Martin Vyhnálek
1Memory Disorders Clinic, Department of Neurology, Second Medical School, Charles University, 150 18 Prague 5, Czech Republic. jakub.hort@seznam.cz
Abstract:
Patients with Alzheimer's disease (AD) frequently have difficulties with spatial orientation in their day-to-day life. Although AD is typically preceded by amnestic mild cognitive impairment (MCI), spatial navigation has not yet been studied in MCI. Sixty-five patients were divided into five groups: probable AD (n = 21); MCI, further classified as amnestic MCI single domain (n = 11); amnestic MCI multiple domain (n = 18), or nonamnestic MCI (n = 7), and subjective memory complaints (n = 8). These patients, together with a group of healthy control subjects (n = 26), were tested by using a four-subtests task that required them to locate an invisible goal inside a circular arena. Each subtest began with an overhead view of the arena showed on a computer monitor. This was followed by a real navigation inside of the actual space, an enclosed arena 2.9 m in diameter. Depending on the subtest, the subjects could use the starting position and/or cues on the wall for navigation. The subtests thus were focused on allocentric and egocentric navigation. The AD group and amnestic MCI multiple-domain group were impaired in all subtests. The amnestic MCI single-domain group was impaired significantly in subtests focused on allocentric orientation and at the beginning of the real space egocentric subtest, suggesting impaired memory for allocentric and real space configurations. Our results suggest that spatial navigation impairment occurs early in the development of AD and can be used for monitoring of the disease progression or for evaluation of presymptomiatic AD.
Insights
Spatial navigation difficulties appear early in Alzheimer's disease (AD) and mild cognitive impairment (MCI). These navigation impairments can help monitor disease progression or evaluate presymptomatic AD.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Gerontology
Background:
- Alzheimer's disease (AD) is characterized by progressive cognitive decline, often manifesting as spatial disorientation.
- Mild cognitive impairment (MCI) precedes AD, but spatial navigation deficits in MCI are not well understood.
- Spatial orientation is crucial for daily functioning and its impairment may indicate early neurodegenerative changes.
Purpose of the Study:
- To investigate spatial navigation abilities in patients with varying stages of cognitive impairment, including MCI and probable AD.
- To determine if spatial navigation deficits are present in early stages of cognitive decline, specifically in amnestic MCI.
- To explore the potential of spatial navigation tasks for monitoring disease progression and identifying presymptomatic AD.
Main Methods:
- A cohort of 65 patients (probable AD, amnestic MCI single/multiple domain, nonamnestic MCI, subjective memory complaints) and 26 healthy controls were recruited.
- Participants completed a four-subtest spatial navigation task involving locating an invisible goal in a circular arena.
- Navigation strategies assessed included allocentric (map-based) and egocentric (self-based) orientation using overhead views and real-space navigation with/without environmental cues.
Main Results:
- Patients with probable AD and amnestic MCI multiple-domain showed significant impairments across all spatial navigation subtests.
- The amnestic MCI single-domain group exhibited deficits in allocentric orientation and initial egocentric navigation, suggesting early memory-related spatial processing issues.
- Nonamnestic MCI and subjective memory complaints groups did not show significant spatial navigation impairments.
Conclusions:
- Spatial navigation impairment is an early indicator in the development of Alzheimer's disease, detectable even in amnestic MCI.
- These findings highlight the potential utility of spatial navigation assessments for early diagnosis and monitoring of AD progression.
- Spatial navigation tasks could serve as valuable tools for evaluating presymptomatic stages of Alzheimer's disease.
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