Flashbacks and post-traumatic stress disorder: the genesis of a 20th-century diagnosis. National Institutes of Health (.gov)
It wasn't until the Vietnam War era and the 1980 inclusion of PTSD in the DSM-III that the flashback became the "hallmark" symptom we recognize today—defined by a vivid, sensory "here-and-now" reliving of events. Flashbacks! Evolution!
This paper explores the of the flashback as a clinical concept, arguing it is a "culture-bound" symptom rather than a universal human reaction to trauma. Key Insights from the Paper Flashbacks! Evolution!