A physiological explanation of traumatic memory can provide a foundation for increased self-acceptance and compassion, which are both foundational for the healing of trauma. Times of extreme stress such as traumatic events can impair how memory is stored and subsequently recalled. As a result, there may be portions of a traumatic memory that are unclear or forgotten. However, even memories with missing elements can still be vividly recalled with fragments of images and highly disturbing somatic sensations. In this excellent article by Arielle Schwartz (link below), she explains in a straightforward and easy-to-understand way the neuroscience of trauma and why understanding this information is an integral part of the healing process. 

https://drarielleschwartz.com/neurobiology-traumatic-memory-dr-arielle-schwartz/#.W8ycNKRMGEc