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正性和负性精神分裂症特质个体在奖赏预期和消费阶段中伏隔核和前额叶的差异改变。

Differential mesolimbic and prefrontal alterations during reward anticipation and consummation in positive and negative schizotypy.

机构信息

Key Laboratory of Brain Functional Genomics, Ministry of Education, Shanghai Key Laboratory of Brain Functional Genomics (MOE & STCSM), East China Normal University, Shanghai, China; Neuropsychology and Applied Cognitive Neuroscience Laboratory, Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing, China.

Neuropsychology and Applied Cognitive Neuroscience Laboratory, Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing, China.

出版信息

Psychiatry Res Neuroimaging. 2016 Aug 30;254:127-36. doi: 10.1016/j.pscychresns.2016.06.014. Epub 2016 Jun 25.

Abstract

Schizotypy is associated with anhedonia. However, previous findings on the neural substrates of anhedonia in schizotypy are mixed. In the present study, we measured the neural substrates associated with reward anticipation and consummation in positive and negative schizotypy using functional MRI. The Monetary Incentive Delay task was administered to 33 individuals with schizotypy (18 positive schizotypy (PS),15 negative schizotypy (NS)) and 22 healthy controls. Comparison between schizotypy individuals and controls were performed using two-sample T tests for contrast images involving gain versus non-gain anticipation condition and gain versus non-gain consummation condition. Multiple comparisons were corrected using Monte Carlo Simulation correction of p<.05. The results showed no significant difference in brain activity between controls and schizotypy individuals as a whole during gain anticipation or consummation. However, during the consummatory phase, NS individuals rather than PS individuals showed diminished left amygdala and left putamen activity compared with controls. We observed significantly weaker activation at the left ventral striatum during gain anticipation in NS individuals compared with controls. PS individuals, however, exhibited enhanced right ventral lateral prefrontal activity. These findings suggest that different dimensions of schizotypy may be underlied by different neural dysfunctions in reward anticipation and consummation.

摘要

分裂型特质与快感缺失有关。然而,之前关于分裂型快感缺失的神经基础的研究结果存在差异。在本研究中,我们使用功能磁共振成像(fMRI)测量了正性和负性分裂型特质与奖赏预期和奖赏实现相关的神经基础。我们对 33 名分裂型特质个体(18 名正性分裂型特质个体,15 名负性分裂型特质个体)和 22 名健康对照者进行了货币激励延迟任务。使用双样本 T 检验对比获得与非获得预期条件和获得与非获得实现条件下的对比图像,对分裂型特质个体与对照组进行了比较。采用蒙特卡罗模拟校正,对 p<.05 进行多重比较校正。结果显示,在获得预期或实现过程中,对照组和分裂型特质个体之间的大脑活动没有显著差异。然而,在实现阶段,与对照组相比,负性分裂型特质个体而非正性分裂型特质个体的左杏仁核和左壳核活动减少。与对照组相比,负性分裂型特质个体在获得预期期间,左腹侧纹状体的激活明显减弱。然而,正性分裂型特质个体的右侧腹外侧前额叶活动增强。这些发现表明,不同维度的分裂型特质可能与奖赏预期和实现的不同神经功能障碍有关。

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