Abstract
Background
Accurately diagnosing depressive symptoms in Alzheimer’s disease (AD) patients is often challenging. Eye movement parameters have been demonstrated as biomarkers for assessing cognition and psychological conditions.
Aim
To investigate the differences in eye movement between AD patients with and without depressive symptoms.
Methods
Eye movement data of 65 AD patients were compared between the depressed AD (D-AD) and non-depressed AD (nD-AD) groups. Logistic regression analysis was employed to identify diagnostic biomarkers and the ROC curve was plotted. The correlation between eye movement and HAMD-17 scores was assessed by partial correlation analysis.
Results
The D-AD patients showed longer saccade latency and faster average/peak saccade velocities in the overlap prosaccade test, longer average reaction time and faster average saccade velocity in the gap prosaccade test, longer start-up durations, slower pursuit velocity, more offsets, and larger total offset degrees in the smooth pursuit test, and poorer fixation stability in both the central and lateral fixation tests compared to nD-AD patients. The start-up duration in the smooth pursuit test and the number of offsets in the central fixation test were identified as the diagnostic eye movement parameters for D-AD patients with the area under the ROC curves of 0.8011. Partial correlation analysis revealed that the start-up duration and pursuit velocity in the smooth pursuit test and the total offset degrees in the lateral fixation test were correlated with HAMD-17 scores in D-AD patients.
Discussion and conclusions
Eye movement differences may help to differentiate D-AD patients from nD-AD patients in a non-invasive and cost-effective manner.
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Availability of data and materials
The datasets analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We would like to thank all the participants in the study and the staff involved.
Funding
This work was supported by Application of Clinical Technology in Elderly Health Research Project in Jiangsu Province (LD2021031); Suzhou Science and Technology Plan Medical and Health Care Science and Technology Innovation Applied Basic Research (SKY2022161); Research Project of Neurological Diseases in the Second Affiliated Hospital of Suzhou University, Research Center (ND2023A01); Jiangsu Provincial Medical Key Discipline for the 14th Five-Year Plan (ZDXK202217).
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Study concept and design: HH, JZ, XW. Acquisition of data: SL, ML. Analysis and interpretation of data: XW, SL, YZ, YZ. Drafting of the manuscript: XW. Critical revision of the manuscript for important intellectual content: HH, CL, JZ. XW: conceptualization, software, formal analysis, visualization, writing—original draft. SL: investigation, formal analysis, data curation, validation. ML: software, data curation, validation. YZ: investigation, formal analysis, methodology. JZ: software, supervision, formal analysis, validation, methodology. CL: writing—review and editing. HH: writing—review and editing, conceptualization, supervision, project administration.
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This study was approved by the ethics committee of the Second Affiliated Hospital of Soochow University (JD-LK-2021-049-01).
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Weng, X., Liu, S., Li, M. et al. Differential eye movement features between Alzheimer’s disease patients with and without depressive symptoms. Aging Clin Exp Res 35, 2987–2996 (2023). https://doi.org/10.1007/s40520-023-02595-5
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DOI: https://doi.org/10.1007/s40520-023-02595-5