College of Mechatronics and Automation, National University of Defense Technology, Changsha, Hunan 410073, China.
Neuroimage. 2010 Feb 15;49(4):3110-21. doi: 10.1016/j.neuroimage.2009.11.011. Epub 2009 Nov 18.
Recently, a functional disconnectivity hypothesis of schizophrenia has been proposed for the physiological explanation of behavioral syndromes of this complex mental disorder. In this paper, we aim at further examining whether syndromes of schizophrenia could be decoded by some special spatiotemporal patterns of resting-state functional connectivity. We designed a data-driven classifier based on machine learning to extract highly discriminative functional connectivity features and to discriminate schizophrenic patients from healthy controls. The proposed classifier consisted of two separate steps. First, we used feature selection based on a correlation coefficient method to extract highly discriminative regions and construct the optimal feature set for classification. Then, an unsupervised-learning classifier combining low-dimensional embedding and self-organized clustering of fMRI was trained to discriminate schizophrenic patients from healthy controls. The performance of the classifier was tested using a leave-one-out cross-validation strategy. The experimental results demonstrated not only high classification accuracy (93.75% for schizophrenic patients, 75.0% for healthy controls), but also good generalization and stability with respect to the number of extracted features. In addition, some functional connectivities between certain brain regions of the cerebellum and frontal cortex were found to exhibit the highest discriminative power, which might provide further evidence for the cognitive dysmetria hypothesis of schizophrenia. This primary study demonstrated that machine learning could extract exciting new information from the resting-state activity of a brain with schizophrenia, which might have potential ability to improve current diagnosis and treatment evaluation of schizophrenia.
最近,一种精神分裂症的功能连接缺失假说被提出,用于解释这种复杂精神障碍的行为综合征的生理机制。在本文中,我们旨在进一步研究精神分裂症的综合征是否可以通过静息态功能连接的某些特殊时空模式来解码。我们设计了一个基于机器学习的数据驱动分类器,以提取高度有区分性的功能连接特征,并将精神分裂症患者与健康对照组区分开来。所提出的分类器由两个独立的步骤组成。首先,我们使用基于相关系数方法的特征选择来提取高度有区分性的区域,并构建分类的最佳特征集。然后,训练了一个结合低维嵌入和 fMRI 自组织聚类的无监督学习分类器,以区分精神分裂症患者和健康对照组。使用留一交叉验证策略测试了分类器的性能。实验结果不仅证明了分类的高准确性(精神分裂症患者为 93.75%,健康对照组为 75.0%),而且在提取特征的数量方面具有良好的泛化性和稳定性。此外,还发现小脑和额叶某些脑区之间的某些功能连接具有最高的区分能力,这可能为精神分裂症的认知运动障碍假说提供了进一步的证据。这项初步研究表明,机器学习可以从患有精神分裂症的大脑的静息状态活动中提取令人兴奋的新信息,这可能有潜力改善精神分裂症的当前诊断和治疗评估。
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