Key result
Late-life depression is linked to higher microsaccade peak velocities and larger amplitudes versus healthy controls.
Why the study?
Objective and cost-effective methods for detecting late-life depression are needed, and whether microsaccade responses are disrupted in these patients remains to be determined.
Does microsaccade behavior differ between patients with late-life depression and healthy age-matched controls?
Case-Control (n=44)
No
Does microsaccade behavior differ between patients with late-life depression and healthy age-matched controls?
Effect estimate: Cohen's d 0.746
p-value: p=0.018
Late-life depression is associated with disrupted microsaccade responses, including higher peak velocities and blunted inhibition/rebound, suggesting potential as a behavioral biomarker.
Microsaccade differences may signal oculomotor disruption in late-life depression; hypothesis-generating for biomarker utility pending prospective validation.
Late-life depression (LLD) is a psychiatric disorder in older adults, characterized by high prevalence and significant mortality rates. Thus, it is imperative to develop objective and cost-effective methods for detecting LLD. Individuals with depression often exhibit disrupted levels of arousal, and microsaccades, as a type of fixational eye movement that can be measured non-invasively, are known to be modulated by arousal. This makes microsaccades a promising candidate as biomarkers for LLD. In this study, we used a high-resolution, video-based eye-tracker to examine microsaccade behavior in a visual fixation task between LLD patients and age-matched healthy controls (CTRL). Our goal was to determine whether microsaccade responses are disrupted in LLD compared to CTRL. LLD patients exhibited significantly higher microsaccade peak velocities and larger amplitudes compared to CTRL. Although microsaccade rates were lower in LLD than in CTRL, these differences were not statistically significant. Additionally, while both groups displayed microsaccadic inhibition and rebound in response to changes in background luminance, this modulation was significantly blunted in LLD patients, suggesting dysfunction in the neural circuits responsible for microsaccade generation. Together, these findings, for the first time, demonstrate significant alterations in microsaccade behavior in LLD patients compared to CTRL, highlighting the potential of these disrupted responses as behavioral biomarkers for identifying individuals at risk for LLD.
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Lee et al. (2025) conducted a case-control in Late-life depression (n=44). Visual fixation task vs. Healthy age-matched controls was evaluated on Microsaccade peak velocity (Cohen's d 0.746, p=0.018). Late-life depression patients exhibited significantly higher microsaccade peak velocities and larger amplitudes compared to age-matched healthy controls.
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