Evidence of dysfunction of a prefrontal-limbic network in schizophrenia: a magnetic resonance imaging and regional cerebral blood flow study of discordant monozygotic twins

Back to table of contents Previous article Next article No AccessEvidence of dysfunction of a prefrontal-limbic network in schizophrenia: a magnetic resonance imaging and regional cerebral blood flow study of discordant monozygotic twinsPublished Online:1 Apr 2006https://doi.org/10.1176/ajp.149.7.890AboutSectionsView articleAbstractPDF/EPUB ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InEmail View articleAbstractOBJECTIVE: The authors previously reported that in monozygotic twins discordant for schizophrenia the affected twin almost invariably had a smaller anterior pes hippocampus, measured with magnetic resonance imaging (MRI), and invariably had less regional cerebral blood flow (rCBF) in the dorsolateral prefrontal cortex during performance of the Wisconsin Card Sorting Test. The present study was an investigation of the relationship between hippocampal pathology and prefrontal hypofunction in the same twin pairs. METHOD: Nine pairs of monozygotic twins discordant for schizophrenia underwent MRI scanning for determination of anterior hippocampal volume and xenon-inhalation rCBF testing for determination of prefrontal physiological activation associated with the Wisconsin Card Sorting Test. RESULTS: The differences within twin pairs on the MRI and rCBF measures were strongly and selectively correlated. Specifically, the more an affected twin differed from the unaffected twin in left hippocampal volume, the more they differed in prefrontal physiological activation during the Wisconsin Card Sorting Test. In the affected twins as a group, prefrontal activation was strongly related to both left and right hippocampal volume. These relationships were not found in the group of unaffected twins. CONCLUSIONS: This finding is consistent with the notion that schizophrenia involves pathology of and dysfunction within a widely distributed neocortical-limbic neural network that has been implicated in, among other activities, the performance of cognitive tasks requiring working memory. Access content To read the fulltext, please use one of the options below to sign in or purchase access. Personal login Institutional Login Sign in via OpenAthens Purchase Save for later Item saved, go to cart PPV Articles - American Journal of Psychiatry $35.00 Add to cart PPV Articles - American Journal of Psychiatry Checkout Please login/register if you wish to pair your device and check access availability. Not a subscriber? Subscribe Now / Learn More PsychiatryOnline subscription options offer access to the DSM-5 library, books, journals, CME, and patient resources. 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