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Is the perception of illusions abnormal in schizophrenia?
Journal article

Is the perception of illusions abnormal in schizophrenia?

  • Grzeczkowski L Laboratory of Psychophysics, Brain Mind Institute, École Polytechnique Fédérale de Lausanne (EPFL), Switzerland; Allgemeine und Experimentelle Psychologie, Department Psychologie, Ludwig-Maximilians-Universität München (LMU), Leopoldstraße 13, München 80802 Germany. Electronic address: lukasz.grzeczkowski@gmail.com.
  • Roinishvili M Laboratory of Vision Physiology, Beritashvili Centre of Experimental Biomedicine, Tbilisi, Georgia; Institute of Cognitive Neurosciences, Free University of Tbilisi, Tbilisi, Georgia.
  • Chkonia E Department of Psychiatry, Tbilisi State Medical University, Tbilisi, Georgia.
  • Brand A Institute of Psychology and Cognition Research, University of Bremen, Germany.
  • Mast FW Department of Psychology, University of Bern, Switzerland.
  • Herzog MH Laboratory of Psychophysics, Brain Mind Institute, École Polytechnique Fédérale de Lausanne (EPFL), Switzerland.
  • Shaqiri A Laboratory of Psychophysics, Brain Mind Institute, École Polytechnique Fédérale de Lausanne (EPFL), Switzerland.
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  • 2018-12-16
Published in:
  • Psychiatry research. - 2018
Adult
Case-Control Studies
Female
Humans
Illusions
Male
Schizophrenic Psychology
Visual Perception
English There seems to be no common factor for visual perception, i.e., performance in visual tasks correlates only weakly with each other. Similar results were found with visual illusions. One may expect common visual factors for individuals suffering from pathologies that alter brain functioning, such as schizophrenia. For example, patients who are more severely affected by the disease, e.g., stronger positive symptoms, may show increased illusion magnitudes. Here, in the first experiment, we used a battery of seven visual illusions and a mental imagery questionnaire. Illusion magnitudes for the seven illusions did not differ significantly between the patients and controls. In addition, correlations between the different illusions and mental imagery were low. In the second experiment, we tested 59 patients (mostly outpatients) with ten visual illusions. As for the first experiment, patients and controls showed similar susceptibility to all but one visual illusion. Moreover, there were no significant correlations between different illusions, symptoms, or medication type. Thus, it seems that perception of visual illusions is mostly intact in schizophrenia.
Language
  • English
Open access status
closed
Identifiers
Persistent URL
https://folia.unifr.ch/global/documents/58234
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