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Perceptual biases and positive schizotypy: The role of perceptual load

By Elias Tsakanikos

Abstract

The study investigated the effects of perceptual load on the bias to report seeing non-existing events—a bias associated with positive symptoms of schizophrenia and positive schizotypal symptoms. Undergraduate students completed psychometric measures of schizotypy and were asked to detect fast moving words among non-words under different levels of perceptual load. Perceptual load was manipulated through stimulus motion. Overall, the results showed that the higher the perceptual load, the stronger the bias to report seeing words in non-word trials. However, the observed bias was associated with positive schizotypy (Unusual Experiences) only when visual detection was performed under conditions of medium perceptual load. \ud No schizotypy measure was associated with accuracy. The results suggest that, although some amount of perceptual ambiguity seems to be necessary for schizotypal bias generation, an increase in the perceptual load can inhibit this process possibly by preventing perception of task-irrelevant internal events, such as loose word associations. \ud \u

Topics: Clinical Psychology
Year: 2006
OAI identifier: oai:cogprints.org:6270

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Citations

  1. (1993). Associative semantic network dys function in thoughtdisordered schizophrenic patients: direct evidence from indirect semantic priming.
  2. (1997). Cognitive factors in source monitoring and auditory hallucinations.
  3. (1983). Continued word association in hypothetically psychosis-prone college students.
  4. (2005). Do positive schizotypal symptoms predict false perceptual experiences in nonclinical populations? doi
  5. (1993). Information processing and attention dysfunction in schizophrenia.
  6. (2005). Less words, more words: psychometric schizotypy and verbal fluency.
  7. (2004). Logical reasoning in schizotypal personality.
  8. (2001). Loose but normal: a semantic association study.
  9. (2001). Modularity in perception, its relation to cognition and knowledge. In
  10. (1997). Modulating irrelevant motion perception by varying attentional load in an unrelated task.
  11. (1995). New scales for the assessment of schizotypy.
  12. (1998). Oxford-Liverpool Inventory of Feelings and Experiences: Reliability in an experimental population.
  13. (2000). Perception, mental imagery and reality discrimination in hallucinating and non-hallucinating schizophrenic patients.
  14. (1995). Reality discrimination, reality monitoring and disposition towards hallucination.
  15. (1985). Reality testing and auditory hallucinations: a signal detection analysis.
  16. (2005). Seeing words that are not there: detection biases in schizotypy. doi
  17. (1998). The mind adrift: attentional disregulations in schizophrenia. In
  18. (1989). The multidimensional nature of schizotypal traits: a factor analytic study with normal subjects.
  19. (1995). The multidimensionality of schizotypy. doi
  20. (1987). The symptoms of chronic schizophrenia: a re-examination of the positive–negative dichotomy.
  21. (2001). Tsakanikos / Personality and Individual Differences 41 (2006) 951–958Rawlings,
  22. (1998). Under-constrained perception: a theoretical approach to the nature and function of verbal hallucinations.
  23. (1998). Word recognition, discrimination accuracy, and decision bias in schizophrenia: associations with positive symptomatology and depressive symptomatology.

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