1Cademy - The Effect of Childhood Trauma on Brain Development

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The Neurobiology of Biological Stress Systems Limbic-Hypothalamic-Pituitary-Adrenal (LHPA) Axis

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The Effect of Childhood Trauma on Brain Development

Being exposed to cumulative life stress was found to be linked with poorer spatial working memory performance and lower volumes of white and gray matter in the prefrontal cortex amongst those who were not maltreated. On the other hand, cerebral and cerebellar volumes are smaller in abused and neglected youth. Having smaller cerebral volumes was also linked with having PTSD trauma earlier, and it was negatively linked to the duration of abuse. Some of the PTSD symptoms that are related to intracranial volume and total corpus callosum measures are intrusive thoughts, avoidance, hyperarousal, and dissociation.
Low socioeconomic status influences brain maturation through ecological variables. Children who had PTSD from maltreatment had smaller intracranial, cerebral, and prefrontal cortex, prefrontal cortical white matter, and right temporal lobe volumes. Regarding brain volumes, larger lateral ventricles were only found in maltreated males. This highlights how males are more susceptible to the neurotoxic effects of childhood maltreatment.
Areas of executive function show how there is adverse brain development in children who have maltreatment-related PTSD. Evidence also highlights how a decrease in N-acetylaspartate (NAA) concentrations is linked to an increase in metabolism and a loss of neurons. Childhood maltreatment hurts the brain networks that allow a person’s ability to think and regulate their sense of self, motivations, and behaviors.
The hippocampus is an essential part of memory. Studies have found that children who have been mistreated and adolescents who have PTSD or subthreshold PTSD showed no differences in limbic structures. There have also been functional brain differences in the amygdala and hippocampus within maltreated youth, suggesting that hippocampal atrophy is a dormant effect of childhood maltreatment.
Childhood maltreatment is linked with adverse brain reward region development. This includes recognizing emotions and social cognition. In adults who were verbally abused, they had reduced fractional anisotropy. In adults who were sexually abused, there were connections with reductions in the hippocampus corpus callosum or frontal cortex, mainly if it occurred in developmental age periods.
Neuroimaging studies of adults who have PTSD have decreased levels of executive and attentional function, as reflected by a decrease in activation in the dorsal control networks. They also increase the amygdala and hippocampus activation, along with other areas of the affective emotional networks. This means that they have dorsal control network deficits and have PTSD as adults.
Specific types of abuse and neglect add to the intergenerational cycle of emotional and behavioral problems and addiction due to the higher level of T2 relaxation time.
Genetic factors are also involved with childhood trauma as they influence brain structure and function. Those with the Val66MET polymorphism of brain-derived neurotrophic factor (BDNF) and who experienced child maltreatment ended up being more likely to have depressive disorders and a smaller hippocampus.
There are gender differences in terms of how maltreatment affects brain development. For boys who have PTSD they had smaller cerebral volumes and larger lateral ventricular volumes. Based on the type of trauma that was experienced also, neglect led to a smaller corpus callosum in boys, while sexual abuse led to a smaller corpus callosum in girls.

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Updated 2025-10-09

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California Baptist University

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