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[Basic cognitive-perceptive module in schizophrenics]

N Franck1, E Daprati, F Michel

  • 1Institut des Sciences Cognitives, CNRS UPR 9075, Bron.

L'Encephale
|February 9, 1999
PubMed
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Schizophrenic patients do not show deficits in basic gaze discrimination. This study suggests impairments in higher-level social cognition, not elementary perception, may explain paranoid symptoms in schizophrenia.

Area of Science:

  • Cognitive Neuroscience
  • Psychiatry

Background:

  • Gaze discrimination is crucial for social interaction.
  • Previous research hypothesized deficits in schizophrenic patients' gaze discrimination, potentially explaining paranoid symptoms.
  • The Eye Direction Detector (EDD) is a proposed cognitive module for processing eye gaze.

Purpose of the Study:

  • To specifically test the elementary gaze discrimination system in schizophrenic patients.
  • To differentiate between basic perceptual abilities and higher-level social cognition in schizophrenia.

Main Methods:

  • Presented 22 schizophrenic patients and 36 controls with portraits showing gaze in five directions.
  • Subjects identified if the gaze was directed left or right.
  • Recorded response accuracy and reaction times.

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Main Results:

  • Schizophrenic patients and controls performed similarly on the gaze discrimination task.
  • No significant differences were found in the ability to discriminate gaze direction between the groups.
  • This indicates unimpaired basic gaze detection in schizophrenia.

Conclusions:

  • Schizophrenic patients are not impaired in elementary gaze discrimination tasks.
  • The findings suggest that difficulties in interpreting gaze as a mental state (mindreading) may underlie paranoid symptoms, rather than a deficit in basic perception.
  • This supports the idea that explicit social-cognitive processes are more affected in schizophrenia than basic perceptual functions.