Children who experience traumatic events may show subtle but measurable differences in how their brains process attention and control impulses, according to a new study published in Neuropsychologia. The research found that youths with higher exposure to non-abuse-related trauma exhibited distinct patterns of brain activity while performing tasks that require sustained attention and inhibition. These neural differences also varied by sex.
The researchers conducted this study to better understand how childhood trauma influences the developing brain. Prior research has linked early traumatic experiences to mental health problems later in life, such as anxiety, depression, and difficulties with attention or impulse control. However, most of these studies focus on adults or clinical populations and often include abuse as a central factor. Less is known about how trauma unrelated to abuse might affect typically developing youths, especially during adolescence, a critical time for brain maturation.
The research team, led by Zinia Pervin and colleagues from institutions including the Mind Research Network and the University of New Mexico, wanted to explore how early trauma might affect brain activity during tasks that require sustained attention and inhibition. They were particularly interested in whether these effects varied by sex, as previous studies have shown different mental health outcomes for boys and girls exposed to trauma. The goal was to identify potential neural markers that could help flag children at risk for future difficulties with executive functioning.
The study involved 65 typically developing children between the ages of 9 and 15. These participants were part of a larger longitudinal study known as the Developmental Chronnecto-Genomics (Dev-CoG) project. None of the children had known neurological or developmental disorders, and all were screened to ensure typical development.
Traumatic experiences were measured using a version of the UCLA Trauma History Profile that excluded questions about abuse, in line with institutional review board guidelines. Children were also asked to complete a symptom checklist assessing signs of anxiety, depression, and stress-related symptoms.
Based on their responses, participants were grouped into either a high-trauma group (more than two traumatic experiences) or a low-trauma group (two or fewer experiences). Importantly, the groups were similar in terms of age, sex, and socioeconomic status, which helped the researchers isolate the effects of trauma exposure.
To assess brain activity, the children completed a task known as the Sustained Attention to Response Task (SART) while undergoing magnetoencephalography (MEG), a technique that records neural activity with high temporal precision. The task requires participants to press a button in response to frequent numbers (Go trials) but to withhold the response when a specific number appears (No-Go trials). This kind of task is commonly used to measure attention and inhibitory control.
The researchers focused on neural responses in several brain regions involved in executive function, including the anterior cingulate cortex, prefrontal cortex, and superior parietal cortex. They measured both the strength (amplitude) and timing (latency) of brain responses during different phases of the task. These were analyzed across three distinct time windows: early sensory processing (100–200 ms), early cognitive evaluation (200–350 ms), and later decision-making (350–550 ms).
Children in the high-trauma group showed reduced amplitude of brain responses in several executive function regions, particularly in the ventral anterior cingulate cortex during Go trials and the superior parietal cortex during incorrect No-Go trials. This suggests that trauma-exposed children may allocate less neural resources when engaging in attention and inhibition tasks, even when they are trying to perform correctly.
The researchers also found differences in the timing of neural responses. During early sensory processing, children with higher trauma exposure showed faster response latencies in the precentral cortex.
While this might seem beneficial, the researchers interpret it as possible evidence of hypervigilance or heightened reactivity, a feature commonly associated with stress-related conditions like post-traumatic stress disorder. These faster responses may reflect a brain that is primed to detect threats quickly, which could become problematic over time if it interferes with accurate decision-making or impulse control.
Additional analyses revealed that trauma-related changes in brain activity varied by sex. For example, boys and girls in the high-trauma group both showed reduced amplitude in the medial orbitofrontal cortex, but the patterns of response timing differed. Males in the high-trauma group exhibited delayed responses in certain regions, while females generally showed faster reaction times during the task. These findings support the idea that trauma may affect males and females differently at the neural level, even if behavioral performance appears similar on the surface.
Interestingly, the researchers found no significant differences in task performance between the trauma groups. While children in the high-trauma group made slightly more errors on No-Go trials, the differences were not statistically significant. This suggests that brain-based measures may be more sensitive than behavior alone in detecting the effects of trauma during development.
As with all research, there are some limitations. First, the participants were not clinically assessed for psychiatric conditions, so the findings cannot be directly linked to mental health diagnoses. Second, the trauma history relied on self-report and did not include detailed information about the type, severity, or timing of traumatic events. This limits the ability to explore whether specific types of trauma are more likely to affect brain function.
The study also did not assess for maltreatment or abuse, which are known to have strong effects on brain development. Although this exclusion was intentional, it leaves open the question of how trauma unrelated to abuse compares to more severe forms of adversity. Finally, while the MEG technique offers precise timing information about brain activity, it cannot identify long-term structural changes. Combining MEG with other methods, such as magnetic resonance imaging, in future studies could provide a more complete picture.
The authors suggest that future research should follow children over time to better understand how early trauma affects the brain as it develops. Longitudinal studies could help determine whether the differences observed in this study persist into adulthood or whether they are temporary changes related to ongoing maturation. Studies that include clinical assessments and broader measures of trauma could also help clarify the relationship between early stress and later mental health outcomes.
The study, “Neural activity is altered by childhood trauma exposure and varied by sex in typically developing youths during sustained attention-to-response tasks (SART),” was authored by Zinia Pervin, Dathan Gleichmann, Isabel Solis, Yu-Ping Wang, Vince D. Calhoun, Tony W. Wilson, and Julia M. Stephen.
