Researchers in Japan say a virtual reality navigation test could help identify early signs of neurodegenerative disease before memory problems become visible.
A study led by scientists at Fujita Health University found that cognitively healthy adults who performed poorly on a virtual reality path integration task were more likely to show faster brain shrinkage over time, along with biological markers linked to Alzheimer’s disease.
The findings, published in Alzheimer’s Research & Therapy, add to growing evidence that changes in spatial navigation may appear earlier than traditional cognitive symptoms associated with Alzheimer’s.
The research followed 71 adults over roughly a year. Participants completed an immersive virtual reality exercise in which they navigated through a digital environment before attempting to return to their starting point without visual guidance. Researchers measured how accurately they could judge both distance and direction.
device and demonstrate that VR path integration performance may help predict risk of
neurodegenerative diseases, including Alzheimer’s disease, potentially facilitating timely lifestyle
modifications and therapeutic interventions.
Image credit: Dr. Hirohisa Watanabe from Fujita Health University, Japan
Those with higher navigation errors at the start of the study later showed greater cortical thinning and volume loss in several brain regions associated with early Alzheimer’s pathology, including the parahippocampal gyrus and posterior cingulate cortex.
The study also linked poorer performance to elevated levels of blood biomarkers including p-tau181 and glial fibrillary acidic protein, both associated with neurodegeneration.
Dr Kazuya Kawabata, Senior Assistant Professor at Fujita Health University and one of the study’s lead authors, said the results suggest navigation performance may reflect changes already taking place in the brain before clinical symptoms emerge.
“Our findings suggest that VR-PI performance captures both molecular and structural signatures that emerge before overt clinical impairment,” he said.
Researchers have increasingly focused on spatial navigation in Alzheimer’s research because the disease often affects the hippocampus and entorhinal cortex in its earliest stages. These areas play a central role in orientation and movement through space.
The authors argue that virtual reality testing could eventually become a practical, non-invasive screening tool to identify people at higher risk of future neurodegeneration.
Independent experts, however, are likely to note that the study remains relatively small and was conducted over a limited timeframe. Larger and longer-term studies would be needed before such tests could be used routinely in clinical practice.
accelerated cortical thinning in vulnerable brain regions and is tied to key blood biomarkers such as
p-tau181 and glial fibrillary acidic protein levels of neurodegeneration.
Image credit: Dr. Hirohisa Watanabe from Fujita Health University, Japan
The research also does not establish that navigation difficulties alone predict Alzheimer’s disease, since changes in spatial awareness can occur in a range of neurological conditions and may also be influenced by ageing.
Still, the study points to a wider shift in dementia research towards identifying biological and behavioural changes years before diagnosis, at a stage when future treatments may have greater impact.
Dr Kawabata said earlier identification of neurodegenerative risk could eventually support earlier intervention and help slow disease progression.
The study was funded by the Japan Agency for Medical Research and Development and other Japanese research initiatives. Researchers also disclosed that VR equipment used in the study was supplied with permission from Tokyo-based company MIG Inc.
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