amygdala

The amygdala is a pair of almond-shaped brain structures that rapidly detect threat and assign emotional meaning to events. In therapy and trauma recovery, it is viewed as a key part of the limbic system that drives fear, anxiety, and startle responses.

During a trauma response, an overactive amygdala can dominate attention, trigger fight–flight–freeze, and overpower the prefrontal cortex, which normally helps with reasoning and impulse control. This can lead to hypervigilance, strong body sensations, and emotional memories that feel immediate. Many therapeutic approaches aim to calm this circuit so the prefrontal cortex and hippocampus can add context and a sense of safety, reducing reactive patterns over time.