Eye Movement Latency Coefficient of Variation as a Predictor of Cognitive Impairment:An Eye Tracking Study of Cognitive Impairment

Polden, Megan and Crawford, Trevor (2023) Eye Movement Latency Coefficient of Variation as a Predictor of Cognitive Impairment:An Eye Tracking Study of Cognitive Impairment. Vision, 7 (2).

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Abstract

Studies have demonstrated impairment in the control of saccadic eye movements in Alzheimer’s disease (AD) and people with mild cognitive impairment (MCI) when conducting the pro-saccade and antisaccade tasks. Research has shown that changes in the pro and antisaccade latencies may be particularly sensitive to dementia and general executive functioning. These tasks show poten-tial for diagnostic use as they provide a rich set of potential eye-tracking markers. One such marker, the coefficient of variation (CV), has so far been overlooked. For biological markers to be reliable they must be able to detect abnormalities in preclinical stages. MCI is often viewed as a predecessor to AD with certain classifications of MCI more likely than others to progress to AD. The current study examined the potential of CV scores on pro and antisaccade tasks to distin-guish participants with AD, amnestic MCI (aMCI), non-amnesiac MCI (naMCI) and older con-trols. The analyses revealed no significant differences in CV scores across the groups using the pro or antisaccade task. Antisaccade mean latencies were able to distinguish participants with AD and the MCI subgroups. Future research is needed into CV measures and attentional fluctuations in AD and MCI individuals to fully assess this measures potential to robustly distinguish clinical groups with high sensitivity and specificity.