Prefrontal functioning during context processing in schizophrenia and major depression: An event-related fMRI study

Avram J. Holmes, Angus MacDonald, Cameron S Carter, Deanna M. Barch, V. Andrew Stenger, Jonathan D. Cohen

Research output: Contribution to journalArticle

99 Scopus citations

Abstract

Patients with schizophrenia frequently demonstrate hypofrontality in tasks that require executive processing; however questions still remain as to whether prefrontal cortex dysfunctions are specific to schizophrenia, or a general feature of major psychopathology. Context processing is conceptualized as an executive function associated with attention and working memory processes. Impairment in the ability of patients with schizophrenia to represent and maintain context information has been previously reported in a number of studies. To examine the question of the specificity of a context processing deficit to schizophrenia, we used functional MRI and an expectancy AX continuous performance task designed to assess context processing in a group of healthy controls (n = 9), depressed patient controls (n = 10), and patients with schizophrenia (n = 7). The behavioral performance was consistent with a context processing deficit in patients with schizophrenia, but not those with depression. The imaging data replicate previous results in showing abnormal activity in the right middle frontal gyrus (BA9) in schizophrenia patients related to context processing.

Original languageEnglish (US)
Pages (from-to)199-206
Number of pages8
JournalSchizophrenia Research
Volume76
Issue number2-3
DOIs
StatePublished - Jul 15 2005
Externally publishedYes

Keywords

  • Context processing
  • Functional MRI
  • Hypofrontality
  • Major depression
  • Prefrontal Cortex
  • Schizophrenia

ASJC Scopus subject areas

  • Psychiatry and Mental health
  • Behavioral Neuroscience
  • Biological Psychiatry
  • Neurology
  • Psychology(all)

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