Electrophysiological recordings in the medial temporal lobe could identify the changes of the memory formulation in the corresponding brain regions. For examples, “Clint Eastwood” neurons/cell in this regions are also firing for the same person with different backgrounds (which is a new memory formation). http://www.nytimes.com/2015/07/07/science/scientists-see-neurons-change-as-memories-form.html...