Summary of Yehuda (2015): Post-traumatic stress disorder

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In the review article Post-traumatic stress disorder (2015), neurobiologist and psychiatrist Rachel Yehuda describes the neurobiological and psychological mechanisms underlying PTSD. The article compiles decades of research into stress regulation, hormones, memory, and intergenerational effects of trauma.

Yehuda emphasizes that PTSD is not merely a psychological reaction, but a dysregulation of the stress system. In particular, the HPA axis (hypothalamus-pituitary-adrenal axis), which regulates the production of the stress hormone cortisol, functions differently in people with PTSD. Instead of chronically elevated cortisol levels, as was long assumed, many people with PTSD actually exhibit lower basal cortisol levels in combination with a hypersensitive stress response. This points to disrupted negative feedback in the stress system.

Additionally, Yehuda discusses changes in brain regions involved in threat detection and emotion regulation, such as the amygdala, hippocampus, and prefrontal cortex. These networks play a role in retaining trauma memories and the difficulty in dampening stress responses. The concept of intergenerational transmission is also addressed: traumatic experiences can influence stress regulation in subsequent generations through epigenetic and relational processes.

The article emphasizes that effective treatment of PTSD must address both psychological and biological components. Trauma-focused therapies, medication, sleep restoration, and interventions that regulate the nervous system can all contribute to recovery. According to Yehuda, PTSD is not a static condition, but a dynamic dysregulation of stress and memory systems that, with the right interventions, can also change.

The work forms an important basis for the current understanding of PTSD as an interplay of body, brain, and experience.