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Prefrontal cortical dysfunction in schizophrenia: an fMRI study

Background

Prefrontal cortical dysfunction has been implicated in the pathophysiology of schizophrenia [1], although functional neuroimaging studies have reported mixed findings. A major concern is that alterations in the prefrontal activation in patients may be related to differences in task demand and performance [2]. This study manipulated task demand during an established frontal task to examine these issues.

Materials and methods

A paced overt verbal fluency task, requiring word generation in response to "easy" or "difficult" auditory letter cues, was used in twelve patients with schizophrenia, and 9 age- and education-matched healthy volunteers. Functional magnetic resonance imaging (fMRI) data were acquired using a clustered acquisition technique to enable monitoring of behavioural responses. Data was analysed using in-house software, XBAM [3].

Results

The patients with schizophrenia demonstrated activation of the left prefrontal cortex, but attenuated activation in the right inferior and middle frontal gyri, anterior cingulate gyrus and cerebellum compared to the healthy controls. As task demand increased, healthy subjects showed increased activation of the anterior cingulate cortex, while the patients demonstrated decreased activation.

Discussion

Patients with schizophrenia demonstrate attenuated activation of the right prefrontal cortex during more demanding verbal fluency task, indicative of demand-related hypofrontality, while additional task-related decreases in anterior cingulate activity may be an early indicator of incipient performance decrement.

References

  1. Barch DM, Carter CS, Braver TS, Sabb FW, MacDonald A, Noll DC, et al: Selective deficits in prefrontal cortex function in medication-naive patients with schizophrenia. Arch Gen Psychiatry. 2001, 58: 280-288. 10.1001/archpsyc.58.3.280.

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Open Access This article is published under license to BioMed Central Ltd. This is an Open Access article is distributed under the terms of the Creative Commons Attribution 2.0 International License (https://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Smee, C., Samson, G., Morley, L. et al. Prefrontal cortical dysfunction in schizophrenia: an fMRI study. Ann Gen Psychiatry 5, S121 (2006). https://doi.org/10.1186/1744-859X-5-S1-S121

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  • DOI: https://doi.org/10.1186/1744-859X-5-S1-S121

Keywords

  • Schizophrenia
  • Prefrontal Cortex
  • Anterior Cingulate Cortex
  • Functional Magnetic Resonance Imaging
  • Task Demand