The role of hippocampus dysfunction in deficient memory encoding and positive symptoms in schizophrenia

Kathrin Zierhut, Bernhard Bogerts, Björn Schott, Daniela Fenker, Martin Walter, Dominik Albrecht, Johann Steiner, Hartmut Schütze, Georg Northoff, Emrah Düzel, K. Schiltz

研究成果: 雜誌貢獻文章

41 引文 斯高帕斯(Scopus)

摘要

Background: Declarative memory disturbances, known to substantially contribute to cognitive impairment in schizophrenia, have previously been attributed to prefrontal as well as hippocampal dysfunction. Aims: To characterize the role of prefrontal and mesolimbic/hippocampal dysfunction during memory encoding in schizophrenia. Method: Neuronal activation in schizophrenia patients and controls was assessed using functional magnetic resonance imaging (fMRI) during encoding of words in a deep (semantic judgement) and shallow (case judgment) task. A free recall (no delay) and a recognition task (24 h delay) were performed. Results: Free recall, but not recognition performance was reduced in patients. Reduced performance was correlated with positive symptoms which in turn were related to increased left hippocampal activity during successful encoding. Furthermore, schizophrenia patients displayed a hippocampal hyperactivity during deep encoding irrespective of encoding success along with a reduced anterior cingulate cortex (ACC) and dorsomedial prefrontal cortex (DMPFC) activity in successful encoding but an intact left inferior frontal cortex (LIFC) activity. Conclusions: This study provides the first evidence directly linking positive symptoms and memory deficits to dysfunctional hippocampal hyperactivity. It thereby underscores the pivotal pathophysiological role of a hyperdopaminergic mesolimbic state in schizophrenia.
原文英語
頁(從 - 到)187-194
頁數8
期刊Psychiatry Research - Neuroimaging
183
發行號3
DOIs
出版狀態已發佈 - 九月 2010
對外發佈Yes

    指紋

ASJC Scopus subject areas

  • Psychiatry and Mental health
  • Radiology Nuclear Medicine and imaging
  • Neuroscience (miscellaneous)
  • Medicine(all)

引用此

Zierhut, K., Bogerts, B., Schott, B., Fenker, D., Walter, M., Albrecht, D., Steiner, J., Schütze, H., Northoff, G., Düzel, E., & Schiltz, K. (2010). The role of hippocampus dysfunction in deficient memory encoding and positive symptoms in schizophrenia. Psychiatry Research - Neuroimaging, 183(3), 187-194. https://doi.org/10.1016/j.pscychresns.2010.03.007