重度抑郁症患者工作记忆更新过程中视觉皮层激活及与前额叶皮层连接的改变。

Alterations in visual cortical activation and connectivity with prefrontal cortex during working memory updating in major depressive disorder.

作者信息

Le Thang M, Borghi John A, Kujawa Autumn J, Klein Daniel N, Leung Hoi-Chung

机构信息

Integrative Neuroscience program, Department of Psychology, Stony Brook University, Stony Brook, NY 11794-2500, United States.

Clinical Science program, Department of Psychology, Stony Brook University, Stony Brook, NY 11794-2500, United States.

出版信息

Neuroimage Clin. 2017 Jan 7;14:43-53. doi: 10.1016/j.nicl.2017.01.004. eCollection 2017.

Abstract

The present study examined the impacts of major depressive disorder (MDD) on visual and prefrontal cortical activity as well as their connectivity during visual working memory updating and related them to the core clinical features of the disorder. Impairment in working memory updating is typically associated with the retention of irrelevant negative information which can lead to persistent depressive mood and abnormal affect. However, performance deficits have been observed in MDD on tasks involving little or no demand on emotion processing, suggesting dysfunctions may also occur at the more basic level of information processing. Yet, it is unclear how various regions in the visual working memory circuit contribute to behavioral changes in MDD. We acquired functional magnetic resonance imaging data from 18 unmedicated participants with MDD and 21 age-matched healthy controls (CTL) while they performed a visual delayed recognition task with neutral faces and scenes as task stimuli. Selective working memory updating was manipulated by inserting a cue in the delay period to indicate which one or both of the two memorized stimuli (a face and a scene) would remain relevant for the recognition test. Our results revealed several key findings. Relative to the CTL group, the MDD group showed weaker postcue activations in visual association areas during selective maintenance of face and scene working memory. Across the MDD subjects, greater rumination and depressive symptoms were associated with more persistent activation and connectivity related to no-longer-relevant task information. Classification of postcue spatial activation patterns of the scene-related areas was also less consistent in the MDD subjects compared to the healthy controls. Such abnormalities appeared to result from a lack of updating effects in postcue functional connectivity between prefrontal and scene-related areas in the MDD group. In sum, disrupted working memory updating in MDD was revealed by alterations in activity patterns of the visual association areas, their connectivity with the prefrontal cortex, and their relationship with core clinical characteristics. These results highlight the role of information updating deficits in the cognitive control and symptomatology of depression.

摘要

本研究考察了重度抑郁症(MDD)对视觉和前额叶皮层活动的影响,以及在视觉工作记忆更新过程中它们之间的连接性,并将其与该疾病的核心临床特征相关联。工作记忆更新受损通常与无关负面信息的保留有关,这可能导致持续的抑郁情绪和异常情感。然而,在MDD患者中,在对情绪加工几乎没有或没有要求的任务上也观察到了表现缺陷,这表明功能障碍也可能发生在信息加工的更基础层面。然而,尚不清楚视觉工作记忆回路中的各个区域如何导致MDD患者的行为变化。我们采集了18名未服药的MDD患者和21名年龄匹配的健康对照(CTL)的功能磁共振成像数据,他们在执行一项以中性面孔和场景作为任务刺激的视觉延迟识别任务时。通过在延迟期插入提示来操纵选择性工作记忆更新,以指示两个记忆刺激(一张面孔和一个场景)中的哪一个或两者对识别测试仍然相关。我们的结果揭示了几个关键发现。相对于CTL组,MDD组在面孔和场景工作记忆的选择性维持期间,视觉联合区域的提示后激活较弱。在所有MDD受试者中,更多的沉思和抑郁症状与与不再相关的任务信息相关的更持续激活和连接有关。与健康对照相比,MDD受试者中场景相关区域的提示后空间激活模式的分类也不太一致。这种异常似乎是由于MDD组前额叶和场景相关区域之间提示后功能连接缺乏更新效应所致。总之,MDD中工作记忆更新的破坏通过视觉联合区域的活动模式改变、它们与前额叶皮层的连接以及它们与核心临床特征的关系得以揭示。这些结果突出了信息更新缺陷在抑郁症认知控制和症状学中的作用。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cf3a/5257188/17a0585e534b/gr1.jpg

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