Reduced corpus-callosum volume in posttraumatic stress disorder highlights the importance of interhemispheric connectivity for associative memory.

Reduced corpus-callosum volume in posttraumatic stress disorder highlights the importance of interhemispheric connectivity for associative memory.
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创伤后应激障碍中胼胝体体积的减少凸显了半球间连接对联想记忆的重要性

DOI:
10.1002/jts.21887
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发表时间:
2014
影响因子:
3.3
通讯作者:
Shalev
Shalev
中科院分区:
医学3区
文献类型:
--
作者:
Saar-Ashkenazy;Shelef;Friedman;Shalev

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记忆障碍是创伤后应激障碍(PTSD)患者的常见症状。尽管有生动的创伤相关记忆,但先前的研究报告称,与对照组相比,非创伤相关刺激的记忆障碍,特别是在联想记忆方面(Guez等人,2011年)。健康个体表现出大脑半球记忆的不对称性,表现为编码的左前额偏侧化和情景提取的右前额偏侧化,这表明大脑半球之间的沟通在记忆相关任务中发挥了作用(Gazzaniga,;Ringo,Doty,Demeter,&Simard,)。由于PTSD患者的脑磁共振成像(BMRI)研究报告了不同区域的体积变化,包括白质和穹隆(CC),我们的目的是测试PTSD患者记忆障碍与CC体积的关系。我们探讨了创伤后应激障碍患者联想记忆的具体变化,并使用bMRI测量了CC内各亚部分的体积。我们的主要发现是创伤后应激障碍患者的CC白质体积与对照组相比减少,t(35)=−2.7,p=0.010,这与较低的联想能力相关(r=0.76,p=0.003)。我们认为CC体积减少是PTSD中发现的联想记忆缺陷的底物。
Memory deficits are a common complaint of patients with posttraumatic stress disorder (PTSD). Despite vivid trauma‐related memory, previous studies report memory impairment for nontrauma‐related stimuli when compared to controls, specifically in associative memory (Guez et al., 2011). Healthy individuals show hemispheric memory asymmetry with left‐prefrontal lateralization of encoding and right‐prefrontal lateralization of episodic retrieval, suggesting a role for interhemispheric communication in memory‐related tasks (Gazzaniga, ; Ringo, Doty, Demeter, & Simard, ). Because brain magnetic resonance imaging (bMRI) studies in PTSD patients report volume changes in various regions, including white matter and corpus callosum (CC), we aimed to test the relationship between memory deficits and CC volume in PTSD patients. We probed for specific alterations in associative memory in PTSD and measured the volume of subportions within the CC employing bMRI. Our main finding was a reduction in CC white‐matter volume in PTSD patients, as compared to controls,t(35) = −2.7,p= .010, that was correlated with lower associative performance (r= .76,p= .003). We propose that CC volume reduction is a substrate for the associative memory deficits found in PTSD.
患有慢性创伤后应激障碍的越南退伍军人的神经状况。
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