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Saccadic suppression in schizophrenia.

Rebekka Lencer1,2,3, Inga Meyhöfer4,5, Janina Triebsch6

  • 1Institute of Translational Psychiatry, University of Münster, Albert-Schweitzer-Campus 1, Geb. A9a, 48149, Münster, Germany. lencer@uni-muenster.de.

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|June 24, 2021
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Summary
This summary is machine-generated.

Schizophrenia patients experience visual disturbances, but their saccadic suppression (visual sensitivity decrease during eye movements) is intact. Visual issues in patients may stem from reduced saccade amplitudes due to cognitive load.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Visual Perception

Background:

  • Approximately 40% of schizophrenia patients report visual disturbances.
  • Saccadic suppression, crucial for visual stability during eye movements, involves efference copy and backward masking, both potentially altered in schizophrenia.
  • Saccadic suppression has not been previously investigated in schizophrenia patients.

Purpose of the Study:

  • To investigate saccadic suppression in individuals with schizophrenia.
  • To explore the relationship between saccadic suppression, visual disturbances, and saccade characteristics in schizophrenia.
  • To determine if saccadic suppression is impaired in schizophrenia patients.

Main Methods:

  • 17 schizophrenia patients and 18 healthy controls participated.
  • A saccadic suppression task using a Gabor stimulus with individually adjusted contrast was employed.
  • Stimuli were presented within a 300 ms interval around saccade onset.

Main Results:

  • Patients reported higher visual disturbance scores than controls.
  • Saccadic suppression strength and time course were similar between groups.
  • Reduced saccade amplitudes in patients during the task correlated with higher visual disturbance scores.
  • Saccade amplitudes were reduced in patients during the saccadic suppression task but not during a control task.

Conclusions:

  • Saccadic suppression appears intact in schizophrenia patients, suggesting preserved efference copy and backward masking mechanisms.
  • Visual disturbances in schizophrenia may be linked to restricted saccadic amplitudes, potentially caused by cognitive load during tasks.
  • Saccadic suppression performance was not associated with symptom severity or medication.