研究：童年创伤的脑结构痕迹或与酒精使用障碍者的脑变化重叠

这项研究在问什么

童年期的虐待与忽视，会在情绪、压力反应和自我控制相关的脑区留下结构差异。这些脑区同样与成瘾行为密切相关。法国兰斯香槟-阿登大学的Franca Schmid与德国海德堡大学的Sarah Gerhardt等研究者想知道：当一个人成年后出现酒精使用障碍，童年创伤与脑结构之间的关系是否还看得见。

研究发表于《Addiction Neuroscience》，纳入84名酒精使用障碍程度不一的成年人（不少来自住院或门诊治疗项目）和83名无物质使用问题的成年人。参与者填写饮酒习惯问卷，以及询问童年期情感、身体、性虐待和情感、身体忽视经历的问卷，随后接受磁共振成像扫描。研究者重点测量四个区域：杏仁核、海马、眶额皮层和额下回，分别对应情绪与记忆、奖赏与决策、冲动控制与情绪调节。

健康组与酒精组的不同图景

先看整体，酒精使用障碍组的四个目标区域灰质体积都低于健康组。这与既有关于长期大量饮酒对脑组织有神经毒性作用的研究方向一致。

再看童年创伤。在健康组中，童年期受虐得分较高的人，右侧额下回灰质体积较低，同时左侧同一区域的皮层折叠程度较高。研究者提出一种解释：折叠增加可能是代偿性反应，这些没有发展出物质使用障碍的人，或许通过改变折叠模式来维持认知功能，帮助自己在创伤史下处理情绪、保持自控。这是作者的解读，不是研究直接验证的机制。

同样的关联在酒精使用障碍组中没有出现。童年创伤得分与灰质体积、折叠程度之间没有显著联系。研究者由此推测，长期大量饮酒造成的组织损失可能掩盖或覆盖了童年逆境留下的较细微痕迹。

校正饮酒严重程度后浮现的痕迹

为检验这一推测，研究者只在酒精使用障碍组内做了一次额外分析：把每个人当前饮酒的严重程度纳入统计校正，相当于先扣除酒精相关损伤这一层。结果，童年创伤得分较高者，左侧额下回皮层更薄。

这提示童年创伤的结构痕迹可能仍然存在，只是被正在进行的重度饮酒造成的更明显变化压住了。需要注意，这一步是探索性分析，且只用了参与者中略小的一个子集——部分人缺少近期饮酒严重程度的完整问卷数据，因此纳入人数减少。

能得出什么，不能得出什么

研究测量的是某一时间点的脑结构，属于横断面设计，无法建立从童年创伤到脑变化再到酒精成瘾的事件链条，只能说明自报创伤与脑测量值之间存在统计关系。

童年创伤信息来自成年后的回溯自评。人的记忆并不可靠，让参与者回忆几十年前的事可能带来记忆偏差；追踪儿童成长的前瞻性研究，报告的创伤比例常与回溯调查不同。

因此，更稳妥的读法是：这项研究提示，在研究童年逆境与脑结构的关系时，需要把当前成瘾的严重程度纳入考虑，否则酒精相关损伤可能干扰对早期痕迹的识别。要真正厘清早期逆境与后来成瘾的叠加影响，需要从童年追踪到成年、在饮酒开始前就测量脑结构并持续观察其变化的研究。

Early childhood maltreatment leaves a distinct structural footprint on the human brain, but chronic alcohol use might obscure or reshape these neurodevelopmental marks over time. A new study published in Addiction Neuroscience reports that while childhood trauma is linked to altered gray matter and brain folding in healthy adults, those specific patterns are largely absent in people with alcohol use disorder. The findings suggest that the heavy physical toll of chronic alcohol consumption may overwrite early structural changes, requiring researchers to account for active addiction severity when searching for the neural signs of childhood adversity.

To understand how experiences alter the physical brain, researchers look at different measurements of its tissue. Gray matter is the brain tissue packed with nerve cell bodies, responsible for processing information. Researchers measure gray matter volume to gauge the overall size of specific brain structures. They also examine the outermost surface layer of this tissue, known as the cerebral cortex, by measuring its physical thickness.

Another important metric is gyrification, or the degree of folding across the brain’s surface. Gyrification begins before birth and helps pack a larger surface area of brain tissue into the limited space of the skull. Folds form primarily during fetal development and early childhood, making them a relatively stable marker of early life events. Cortical thickness, on the other hand, can change more readily throughout adulthood due to aging or environmental toxins like alcohol.

Adverse experiences during childhood, such as emotional neglect or physical abuse, can disrupt early neurodevelopment. These experiences often lead to lasting structural changes in brain areas that manage emotion, stress, and self-control. These same brain regions are heavily implicated in addictive behaviors later in life.

Lead author Franca Schmid, a researcher at the Université de Reims Champagne-Ardenne in France, and corresponding author Sarah Gerhardt, a researcher at Heidelberg University in Germany, wanted to explore how trauma and alcohol interact physically in the brain. The research team set out to map how childhood maltreatment relates to brain structure in adults with and without an active addiction to alcohol.

They focused their investigation on four specific brain regions known to be sensitive to both stress and addiction. The amygdala and hippocampus process emotions, handle stress responses, and manage memories. The orbitofrontal cortex helps the brain value rewards and make decisions. Finally, the inferior frontal gyrus acts as the brain’s braking system, managing impulse control and the regulation of emotions.

The research team analyzed data from 84 individuals with varying severity of alcohol use disorder, many of whom were recruited from inpatient or outpatient treatment programs, and 83 adults with no history of substance use issues. Participants completed extensive surveys detailing their alcohol consumption habits. They also completed questionnaires asking if they had experienced emotional, physical, or sexual abuse, or emotional and physical neglect during childhood.

Following the surveys, the researchers used magnetic resonance imaging, or MRI, to capture high-resolution, three-dimensional scans of each participant’s brain. Specialized computer software then mapped the volume, thickness, and folding patterns of the four targeted brain regions.

Looking at overall brain volume, the researchers found that adults with alcohol use disorder had reduced gray matter across all the examined regions when compared to the healthy adults. This overall reduction aligns with extensive previous research detailing the neurotoxic effects of chronic, heavy alcohol exposure, which physically shrinks brain tissue over time.

The researchers then looked for structural changes linked specifically to childhood trauma rather than alcohol. In the healthy group, individuals who reported higher levels of early life maltreatment exhibited reduced gray matter volume in the right side of the inferior frontal gyrus. At the same time, these healthy adults showed an increase in cortical folding on the left side of the exact same brain region.

This increase in folding might represent a biological compensatory response. Because these individuals did not develop a substance use disorder, their brains might have adapted to early stress by altering their folding patterns to maintain cognitive functions. Structural changes in the inferior frontal gyrus might help resilient individuals process emotions and maintain self-control despite a history of trauma.

These trauma-related patterns did not appear in the adults with alcohol use disorder. The addiction group showed no link between childhood trauma scores and gray matter volume or brain folding. The absence of these specific differences suggests that chronic alcohol exposure might mask the structural signatures of early childhood adversity. The severe tissue loss caused by years of heavy drinking might physically erase or overshadow the earlier, more subtle changes caused by childhood trauma.

To test this idea, the researchers conducted an additional analysis restricted entirely to the alcohol use disorder group. When they statistically adjusted the data to account for the exact severity of each patient’s current alcohol consumption, a different pattern emerged.

By factoring in the intensity of the addiction, the researchers peeled back a layer of alcohol-related damage. In this adjusted analysis, higher rates of childhood trauma were associated with a thinner cerebral cortex in the left inferior frontal gyrus of the patients. This suggests that the structural traces of childhood trauma are still present in these individuals, but they are hiding beneath the more prominent damage caused by active, heavy drinking.

Because the study measured brain structure at a single point in time, the results cannot establish a direct chain of events from childhood trauma to brain changes to alcohol addiction. Researchers cannot prove causality from a cross-sectional design. They can only establish that a mathematical relationship exists between the reported trauma and the physical brain measurements.

The study also relied on retrospective self-reports of childhood trauma. Human memory is fallible, and asking individuals to recall events from decades past can result in memory biases. Prospective studies, which follow children in real-time as they grow, often yield different rates of reported trauma than retrospective surveys.

The analysis of cortical thickness in the alcohol use disorder group was an exploratory step conducted on a slightly smaller subset of the participants. Some patients did not have complete survey data for their recent alcohol severity, reducing the number of people included in that specific test.

Future research requires tracking individuals over long periods of time, from childhood straight into adulthood. Researchers need to measure brain structure before alcohol use begins and monitor how the tissue changes as drinking escalates. Only by watching the brain change over time can researchers fully map the overlapping impacts of early adversity and later addiction.

The study, “Childhood Maltreatment Related Effects on Brain Structure in Alcohol Use Disorder,” was authored by Franca Schmid, Fabien Gierski, Falk Kiefer, Cagdas Türkmen, Audrey Henry, Bernd Lenz, Farid Benzerouk, Arthur Kaladjian, Sabine Vollstädt-Klein, and Sarah Gerhardt.