Under ordinary conditions these two memory systems—rational and emotional—collaborate to produce an integrated response. But high arousal not only changes the balance between them but also disconnects other brain areas necessary for the proper storage and integration of incoming information, such as the hippocampus and the thalamus.5 As a result, the imprints of traumatic experiences are organized not as coherent logical narratives but in fragmented sensory and emotional traces: images, sounds, and physical sensations.
