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Related Experiment Videos

Perseveration and over-switching in schizophrenia.

Herzel Yogev1, Uri Hadar, Yaakov Gutman

  • 1Department of Psychology, Tel Aviv University, Ramat-Aviv 69978, Israel. hyogev@yahoo.com

Schizophrenia Research
|May 6, 2003
PubMed
Summary

Schizophrenia patients with positive symptoms tend to switch attention more, while those with negative symptoms perseverate more. This study introduces a new tool to measure these attention deficits in schizophrenia.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Cognitive Psychology

Background:

  • Perseveration and switching are attention deficits in schizophrenia, often studied separately.
  • Their integrated investigation is crucial for understanding neurophysiological deficits in schizophrenia.

Purpose of the Study:

  • To develop a tool for simultaneous measurement of perseveration and switching.
  • To investigate the relationship between these attention deficits in positive and negative schizophrenia.

Main Methods:

  • Developed the Combined Attention Test (CAT) for simultaneous measurement.
  • Tested 41 unmedicated schizophrenic patients and 24 healthy controls.
  • Classified patients using the Positive and Negative Syndrome Scale (PANSS).

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Main Results:

  • Schizophrenia patients with positive symptoms showed increased switching compared to negative schizophrenics and controls.
  • Schizophrenia patients with negative symptoms exhibited more perseveration than positive schizophrenics and controls.
  • Over-switching is proposed as a symptom specific to positive schizophrenia.

Conclusions:

  • The Combined Attention Test (CAT) effectively measures perseveration and switching in schizophrenia.
  • Distinct attention patterns characterize positive and negative schizophrenia.
  • Findings contribute to the neurophysiological understanding of schizophrenia subtypes.