Memory, history and ordinary knowledge

How do we form the representation of the reality of the past? which role do play memory, imagination and epistemic constructions of the historical knowledge? Developing his philosophical perspective, in Ninety Years Paul Ricoeur focused his attention on relation between memory and history, to search for giving reasons for naive realism of historians. The function of the psychical original trace, who mind receives, is very important and irreducible; natural competences ad common sense enable us to recognize immediately it as a sign dependent on the past circumstances and events.