Components of visual search in childhood-onset schizophrenia and attention-deficit/hyperactivity disorder

Canan Karatekin, Robert F. Asarnow

Research output: Contribution to journalArticlepeer-review

42 Scopus citations


This study tested the hypotheses that visual search impairments in schizophrenia are due to a delay in initiation of search or a slow rate of serial search. We determined the specificity of these impairments by comparing children with schizophrenia to children with attention-deficit hyperactivity disorder (ADHD) and age-matched normal children. The hypotheses were tested within the framework of feature integration theory by administering children tasks tapping parallel and serial search. Search rate was estimated from the slope of the search functions, and duration of the initial stages of search from time to make the first saccade on each trial. As expected, manual response times were elevated in both clinical groups. Contrary to expectation, ADHD, but not schizophrenic, children were delayed in initiation of serial search. Finally, both groups showed a clear dissociation between intact parallel search rates and slowed serial search rates.

Original languageEnglish (US)
Pages (from-to)367-380
Number of pages14
JournalJournal of Abnormal Child Psychology
Issue number5
StatePublished - Nov 17 1998


  • Attention-deficit hyperactivity disorder (ADHD)
  • Parallel and serial search
  • Saccadic eye movements
  • Schizophrenia
  • Visual-spatial attention

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