Eye Tracking as a Tool for Detecting Alzheimer's Disease in People With Down Syndrome.
Brianna Piro-Gambetti, Sharon Krinsky-McHale, Cynthia Kovacs and 10 others
PMID 39929153WHAT IT FOUND
Eye tracking showed promise for detecting early Alzheimer's changes in adults with Down syndrome, including those with severe intellectual disability.
Smaller eye movements and less attention to new images linked to older age and higher pathology. This method is feasible but needs larger trials to prove it works.
Key findings
01Eye-tracking metrics were associated with Alzheimer's biomarkers and cognitive impairment scores, particularly in adults with IQs of 45 or below.
02The pattern of eye movements differed from the general population, where smaller saccades and lack of novelty preference indicated worse outcomes in this group.
03The task was feasible for all participants, including those with severe intellectual disability who often have floor effects on standard cognitive tests.
STILL TO COME
How it was doneWhat they foundWhat it means for OTsWhat it means for SLPs
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What it does not show
The sample size was small, which limits statistical power. Eye-tracking calibration had low accuracy and precision, though large areas of interest were used to mitigate this. The study was cross-sectional, so it cannot confirm that eye-tracking changes predict the onset of dementia over time. The equipment requires significant training and financial resources, making it less accessible for routine clinical use.
Declared interests
The authors declared no conflicts of interest. The study was funded by the National Institutes of Health.
The easy way to misread this
Do not use this to justify diagnosing Alzheimer's in patients with Down syndrome today. The eye-tracking pattern found here is specific to this population and differs from the general adult population, and the study is too small and preliminary to establish diagnostic criteria.