期刊
PSYCHOLOGICAL MEDICINE
卷 42, 期 2, 页码 267-282出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S003329171100119X
关键词
Dorsolateral prefrontal cortex; functional MRI; negative symptoms; schizophrenia; striatum
资金
- NIH/NCRR [P41RR14075]
- Department of Energy [DE-FG02-99ER62764]
- MIND Research Network
- Morphometry BIRN [1U24]
- Function BIRN [U24RR021992-01]
- NIH.NCRR [MO1 RR025758-01]
- NIMH [K23 MH076054]
- NARSAD
- Sidney R. Baer, Jr. Foundation
- NIMH
- Deutsche Forschungsgemeinschaft
- AstraZeneca
- Eli Lilly
- [RR021382A]
Background. Previous studies have suggested that motivational aspects of executive functioning, which may be disrupted in schizophrenia patients with negative symptoms, are mediated in part by the striatum. Negative symptoms have been linked to impaired recruitment of both the striatum and the dorsolateral prefrontal cortex (DLPFC). Here we tested the hypothesis that negative symptoms are associated primarily with striatal dysfunction, using functional magnetic resonance imaging (fMRI). Method. Working-memory load-dependent activation and gray matter volumes of the striatum and DLPFC were measured using a region-of-interest (ROI) approach, in 147 schizophrenia patients and 160 healthy controls. In addition to testing for a linear relationships between striatal function and negative symptoms, we chose a second, categorical analytic strategy in which we compared three demographically and behaviorally matched subgroups: patients with a high burden of negative symptoms, patients with minimal negative symptoms, and healthy subjects. Results. There were no differences in striatal response magnitudes between schizophrenia patients and healthy controls, but right DLPFC activity was higher in patients than in controls. Negative symptoms were inversely associated with striatal, but not DLPFC, activity. In addition, patients with a high burden of negative symptoms exhibited significantly lower bilateral striatal, but not DLPFC, activation than schizophrenia patients with minimal negative symptoms. Working memory performance, antipsychotic exposure and changes in gray matter volumes did not account for these differences. Conclusions. These data provide further evidence for a robust association between negative symptoms and diminished striatal activity. Future work will determine whether low striatal activity in schizophrenia patients could serve as a reliable biomarker for negative symptoms. Received 6 January 2011; Revised 20 May 2011; Accepted 6 June 2011; First published online 7 July 2011
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据