In his 1882 book, “Diseases of Memory: An Essay in the Positive Psychology “,[3] Ribot explained the retroactive phenomena of trauma or event-induced memory loss. Patients who incurred amnesia from a specific event such as an accident often also lost memory of the events leading up to the incident as well. In the case of some, this retrograde loss included several years leading up to the precipitating event of injury or trauma had occurred – yet left much older memories intact – suggesting that the effect was not just due to interference with consolidation of memories immediately before brain damage.