An interpolated event is something that happens subsequent to the original event that may lead to a recoding of the original engram into a recoded engram.   Interestingly,  it appears that observers cannot distinguish a recoded engram from the original engram.  It is unclear if the new memory overwrites the old memory or if the new memory is just more accessible.  For example, if the original event was a car accident, you might be asked to provide a description of the car accident in a police report.   It is quite possible that providing a description of the accident actually changes your memory of the event.  Interpolated events, recoding, and the recoded engrams have important consequences for the legal system.