J PSYCHIATR RES:妄想症工作记忆功能障碍fMRI分析

2014-08-21 restsli 丁香园

妄想症又称妄想性障碍,是一种很少被人理解的精神疾病。指“抱有一个或多个非怪诞性的妄想,同时不存在任何其他精神病症状”。妄想症患者没有精神分裂症病史,也没有明显的幻视产生。但视具体种类的不同,可能出现触觉性和嗅觉性幻觉。尽管有这些幻觉,妄想性失调者通常官能健全,且不会由此引发奇异怪诞的行为。目前,对妄想症认知特征的研究屈指可数。针对这种情况,土耳其伊斯坦布尔大学 Serap Oflaz博士等人进行了

妄想症又称妄想性障碍,是一种很少被人理解的精神疾病。指“抱有一个或多个非怪诞性的妄想,同时不存在任何其他精神病症状”。妄想症患者没有精神分裂症病史,也没有明显的幻视产生。但视具体种类的不同,可能出现触觉性和嗅觉性幻觉。尽管有这些幻觉,妄想性失调者通常官能健全,且不会由此引发奇异怪诞的行为。目前,对妄想症认知特征的研究屈指可数。

针对这种情况,土耳其伊斯坦布尔大学 Serap Oflaz博士等人进行了一项研究,研究结果显示,在进行工作记忆的表现性评价任务时,妄想症患者大脑区域的前额叶,颞叶和边缘区域存在功能障碍。该研究成果最近发表在Journal of Psychiatric Research杂志上。

该研究为病例对照研究,研究纳入9名妄想症患者以及年龄,性别和教育水平相匹配的9名健康对照个体。使用DSM-IV临床定式检查确认妄想症的诊断,同时,使用阳性和阴性症状量表(PANSS)评定患者的精神症状及严重程度。利用fMRI,通过使用一个既定的不同记忆负载水平的工作记忆范例,研究妄想症患者的大脑区域活动。

在进行fMRI试验时,要求所有患者执行0-back和2-back任务。对正在进行表现性评价任务的参与者进行fMRI扫描,fMRI结果显示,妄想症患者左背外侧前额叶皮层的神经活动较少。另一方面,同对照组相比,妄想症患者的左右颞上回,左中颞下回,右侧和左侧扣带后回,右侧杏仁核和左右梭状回的神经活动较为显著。

从该研究来看,当前发现与先前报道的大脑前额叶边缘区域功能缺陷的研究结果一致。在进行工作记忆的表现性评价任务时,妄想症患者大脑区域的前额叶,颞叶和边缘区域存在功能障碍。并且,妄想症患者同精神分裂症患者一样,同样表现为前额叶功能障碍。

原始出处:

Serap Oflaz, Fatma Akyuz, Andac Hamamci, Zeynep Firat, Cahit Keskinkılıç, Ozgur Kilickesmez, Mutlu Cihangiroglu.Working memory dysfunction in delusional disorders: An fMRI investigation.Journal of Psychiatric Research.May 07, 2014


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