Development and preliminary validation of a virtual reality memory test for assessing visuospatial memory

Area of Science:

• Neuroscience
• Cognitive Psychology
• Gerontology

Background:

• Visuospatial memory impairment is a hallmark of Alzheimer's disease (AD).
• Conventional tests inadequately capture real-world visuospatial memory deficits.
• Difficulties in object localization and recall are common in daily life for AD patients.

Purpose of the Study:

• Introduce a novel virtual reality visuospatial memory test, the Hidden Objects Test (HOT).
• Assess the ecological validity of HOT by comparing it with conventional tests.
• Analyze movement patterns in VR to understand spatial navigation in AD and MCI.

Main Methods:

• Developed the Hidden Objects Test (HOT) in a virtual house environment.
• Administered HOT to individuals with Alzheimer's disease (AD), amnestic mild cognitive impairment (aMCI), and normal controls (NC).
• Collected and analyzed HOT scores, movement trajectories, and conventional neuropsychological test data.

Main Results:

• Total HOT scores significantly differed across AD, aMCI, and NC groups (p < 0.001).
• HOT scores positively correlated with conventional memory test scores (p < 0.001).
• Patients with AD and aMCI exhibited wandering trajectories, increased duration, higher outlier counts, and more stay points compared to NC.

Conclusions:

• The HOT shows promise as an ecologically valid tool for assessing real-world visuospatial memory.
• Virtual reality-based trajectory analysis provides insights into navigation deficits in AD and aMCI.
• HOT and associated movement analysis can aid in the early detection and characterization of cognitive impairment.