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Eye Movement Monitoring of Memory

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Published on: August 15, 2010

Fixation Task: A Simple Eye Movement Task Reveals an Impairment in Schizophrenia.

Vanteemar S Sreeraj¹, H V Raghuram², Swarna Buddha Nayok¹

¹Department of Psychiatry, National Institute of Mental Health and Neurosciences, Bengaluru, India.

Schizophrenia Bulletin

|July 14, 2025

Summary

Fixation stability (FS) is impaired in individuals with schizophrenia (SCZ) and worsens with distractors. This eye-tracking measure may serve as an endophenotype marker for schizophrenia vulnerability.

Keywords:

antipsychotic naïve distraction endophenotype fixation stability laterality

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Area of Science:

Neuroscience
Ophthalmology
Psychiatry

Background:

Fixation stability (FS) is crucial for visuomotor processing and can be assessed via eye-tracking.
FS evaluation with and without distractors may identify endophenotype markers for schizophrenia (SCZ).

Purpose of the Study:

To investigate fixation stability (FS) in antipsychotic-naïve/free SCZ, their first-degree relatives (FDRs), and healthy controls (HC).
To assess the impact of distractors on FS in these groups.
To explore FS as a potential endophenotype marker for SCZ.

Main Methods:

High-frequency monocular eye tracking was used during a fixation stability task.
Participants included 69 SCZ, 49 FDRs, and 76 HC.
Data analyzed using ANCOVA and RMANCOVA to assess group differences and distractor effects.

Main Results:

SCZ exhibited significantly poorer FS (higher fixation frequency, saccade amplitude, scanpath length) than controls, even without distractors.
Distractors further degraded FS performance in SCZ.
FDRs showed impaired median fixation duration.
A rightward bias in distractor effect was observed in SCZ and FDRs.

Conclusions:

FS is impaired in SCZ and is exacerbated by distractors.
Observed laterality effects suggest a potential link between visual functional asymmetry and SCZ vulnerability.
FS warrants further investigation as an illness marker across different clinical stages of SCZ.