# 52. Manipulation of Memory ## 52.5. Methodology/Refinements/Sub-species ### 52.5.17. Levelling and Sharpening These memory distortions are introduced by the loss of detail in a recollection over time, often concurrent with the sharpening or selective recollection of certain details that take on exaggerated significance in relation to the experience lost through levelling. Both biases may be reinforced over time, and by repeated recollection or re-telling of a memory. This tendency can be used by a manipulator to alter a victim's recollection of events, and create new conclusions or reinforce existing conclusions about events in the past. Already, few of us can remember the details of how Tony Blair lied to the British Parliament to persuade MPs to sanction the use of military force in Iraq. We remember it was immoral and illegal but we don't quite remember the details anymore. The manipulator hopes that this "dulling" effect will give them time for things to blow over, hoping and expecting that time will "wash all things clean". It doesn't usually work over the long term because historians and survivors often wish to determine the truth.