Cognitive Function Assessment Through Eye Movement Analysis

Eye movement analysis has emerged as a powerful non-invasive approach to probe cognitive function by quantifying oculomotor behaviours that reflect underlying neural processes. Metrics such as saccade latency, fixation stability, smooth pursuit accuracy and novelty preference correlate with attention, working memory, executive control and visuospatial processing. These measures offer continuous, quantitative data that can complement traditional pen-and-paper neuropsychological tests, enabling early detection of mild cognitive impairment and monitoring of disease progression in conditions such as Alzheimer’s disease and frontotemporal dementia. Advances in hardware and software have increased tracking precision, reduced cost and improved portability, leading to applications ranging from laboratory-based eye-tracking systems to device-embedded cameras in tablets and smartphones. Integration with machine-learning algorithms has further enhanced diagnostic accuracy, enabling automated classification of cognitive states and prediction of decline. Globally, eye-movement assessment holds promise for large-scale screening, remote monitoring and personalised intervention, offering a window into brain function that is both accessible and scalable across diverse clinical and research settings.

Research from Nature Portfolio

A rapid assessment protocol utilising high-performance eye-tracking technology demonstrated quantitative scoring of gaze patterns in task-based stimuli, achieving robust differentiation between cognitively healthy controls, individuals with mild cognitive impairment and patients with dementia. Participants viewed brief sequences of images and videos while their gaze trajectories were recorded, and cognitive scores derived from gaze metrics showed strong correlations with standard neuropsychological test scores. The protocol required under three minutes per participant and achieved high sensitivity and specificity for detecting early cognitive decline. This work underscores the feasibility of brief, objective eye-tracking assessments as a complement to conventional screening methods, paving the way for routine clinical use.

Cognitive Function Assessment Through Eye Movement Analysis publication trend

The graph below shows the total number of articles in cognitive function assessment through eye movement analysis across all publications each year (not limited to Nature Index journals).

Technical terms

Saccade: Rapid ballistic eye movement that shifts the line of sight between points.

Prosaccade: Reflexive saccade directed toward an external stimulus.

Antisaccade: Volitional saccade executed in the opposite direction to a visual cue.

Smooth pursuit: Continuous eye movement that maintains fixation on a moving object.

Novelty preference: Tendency to allocate longer gaze to unfamiliar stimuli in recognition tasks.

Fixation: Period during which the eyes are steadily maintained on a single location.

References

1. Eye tracking based detection of mild cognitive impairment: A review. Information Fusion (2025).
2. Novel Method for Rapid Assessment of Cognitive Impairment Using High-Performance Eye-Tracking Technology. Scientific Reports (2019).
3. Device-Embedded Cameras for Eye Tracking–Based Cognitive Assessment: Validation With Paper-Pencil and Computerized Cognitive Composites. Journal of Medical Internet Research (2018).
4. The effectiveness of eye tracking in the diagnosis of cognitive disorders: A systematic review and meta-analysis. PLOS ONE (2021).
5. Distinctive Oculomotor Behaviors in Alzheimer's Disease and Frontotemporal Dementia. Frontiers in Aging Neuroscience (2021).