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Eye Movement Abnormalities in Major Depressive Disorder.

Junichi Takahashi1, Yoji Hirano1,2, Kenichiro Miura3

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|August 27, 2021
PubMed
Summary

Eye movement tests show potential as biomarkers for major depressive disorder (MDD). Specific scanpath and saccade measures differentiated MDD patients from healthy controls, particularly in older adults.

Keywords:
alerted aging effectdiscriminant analysiseye movementsfixation stability test and smooth pursuit testfree-viewing testmajor depressive disorder

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Ophthalmology

Background:

  • Major depressive disorder (MDD) diagnosis is challenging, necessitating reliable biomarkers.
  • Eye movements are explored as non-invasive biomarkers for psychiatric disorders, but their role in MDD requires clarification.

Purpose of the Study:

  • To evaluate detailed eye movement measurements as potential biomarkers for diagnosing MDD.
  • To validate the usefulness of specific eye movement parameters in differentiating MDD patients from healthy controls.

Main Methods:

  • Recorded eye movements in 37 MDD patients and 400 healthy controls (HCs) across five university hospitals.
  • Administered free-viewing, fixation stability, and smooth pursuit tests, collecting 35 eye movement measurements.
  • Utilized analyses of covariance, discriminant analysis, and receiver operating characteristic (ROC) analysis, considering age as a covariate.

Main Results:

  • MDD patients exhibited significantly shorter scanpath lengths in free-viewing and shorter saccade durations with lower peak velocities in smooth pursuit.
  • No significant group differences were found in fixation stability tests.
  • Discriminant analysis achieved 72.1% accuracy in distinguishing MDD from HCs using scanpath length and peak saccade velocity; ROC analysis yielded an area under the curve of 0.76.

Conclusions:

  • Detailed eye movement analysis can aid in differentiating MDD from HCs.
  • The diagnostic utility of these eye movement biomarkers appears more pronounced in older individuals.