title: Jumping to conclusions and perceptions in early psychosis: relationship with delusional beliefs.
abstract: BACKGROUND
  Previous research has suggested that biases in cognitive processes involved in everyday reasoning may contribute to the development of delusional beliefs. The aim of this study was to explore jumping to conclusions (JTC), a data-gathering bias, and jumping to perceptions (JTP), a bias towards believing ambiguous perceptual events are real and external.
  
  
  METHODS
  Individuals with current delusions (n=17), remitted delusions (n=17), both recruited from an early psychosis service, and nonclinical participants (n=35) were compared on a probabilistic reasoning task, an auditory perceptual bias task, and the Barely Visible Words task.
  
  
  RESULTS
  The deluded participants did not demonstrate the expected JTC bias; therefore the relationship between JTC and JTP could not be examined. However, both clinical groups exhibited a JTP bias on the auditory perceptual bias task. In contrast, the lowered perceptual threshold for threat displayed by the control group was absent in the clinical groups.
  
  
  CONCLUSIONS
  These results suggest that the JTP bias may be a trait characteristic in those with a propensity to delusions, and that these individuals may also show a bias away from threat.
authors.affiliation: Department of Psychology, King's College London, Institute of Psychiatry, London, UK.
authors.forename: Susannah May
authors.initials: SM
authors.lastname: Colbert
authors.forename: Emmanuelle
authors.initials: E
authors.lastname: Peters
authors.forename: Philippa
authors.initials: P
authors.lastname: Garety
mesh_terms: D000293:Adolescent; D000328:Adult; D014150:Antipsychotic Agents / Q000627:therapeutic use; D001007:Anxiety / Q000523:psychology; D001307:Auditory Perception / Q000502:physiology; D003702:Delusions / Q000523:psychology*; D003863:Depression / Q000523:psychology; D006801:Humans; D007326:Institutionalization; D007361:Intelligence Tests; D008134:Long-Term Care; D008606:Mental Processes; D009483:Neuropsychological Tests; D011569:Psychiatric Status Rating Scales; D011597:Psychomotor Performance / Q000502:physiology; D011618:Psychotic Disorders / Q000150:complications / Q000523:psychology*; D011932:Reading; D012563:Schizophrenia, Paranoid / Q000523:psychology; D055815:Young Adult
chemical_list: D014150:Antipsychotic Agents