# 52. Manipulation of Memory ## 52.5. Methodology/Refinements/Sub-species ### 52.5.32. Testing effect Frequent re-visiting or re-examination of particular memories improves their recall. The constant repetition and re-examination of material in our memory by a manipulator can be used to maintain this material close to the top of the victim's memory, for example, "Don't forget what happened the last time…."