Comparison of three computer-administered cognitive tasks as putative endophenotypes of schizophrenia

Jeffrey S. Bedwell, Vidyulata Kamath, Elizabeth Baksh

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


It has been repeatedly demonstrated that individuals with schizotypal personality features (SPF) exhibit similar endophenotypic traits as persons with schizophrenia. Less research has compared the relative sensitivity of different endophenotypes in the same sample of individuals with SPF. Fourteen university students with SPF (mean age 20.5 ± 1.6; 43% male) and 26 controls (mean age 20.3 ± 1.1; 31% male) were defined by the Abbreviated Schizotypal Personality Questionnaire (SPQ-B). All participants reported no known biological relative with schizophrenia. Participants completed three computer-administered cognitive tasks: a 6-min degraded-stimuli A-X Continuous Performance Test (CPT), the Wisconsin Card Sort Test (WCST), and a Span of Apprehension (SOA) task (6- and 12-letter arrays). On the CPT, only omission errors resulted in a statistically significant group difference, U = 115.5, p = .05, Cohen's d = 0.54 (medium effect size), with the SPF group (mean errors: 3.43 ± 3.28) making more omission errors than controls (mean errors: 1.88 ± 2.66). Notably, 46% of the controls had no omission errors, compared to 14% of the SPF group. The only SPQ-B factor score to show a statistically significant linear relationship with CPT omission errors was the Cognitive-Perceptual factor (rs = .33, p = .04). Group differences on performance indices from the SOA and WCST did not approach statistical significance. Based on performance from the community-identified schizotypes, results suggest that performance on the CPT may represent a more robust endophenotype of schizophrenia, compared to the SOA and WCST.

Original languageEnglish (US)
Pages (from-to)36-46
Number of pages11
JournalSchizophrenia Research
Issue number1-3
StatePublished - Dec 2006
Externally publishedYes


  • Continuous Performance Test
  • Endophenotypes
  • Schizophrenia
  • Schizotypal personality questionnaire
  • Schizotypy

ASJC Scopus subject areas

  • Psychiatry and Mental health
  • Biological Psychiatry


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