Diagrams of neural activity in the hippocampus, recorded from a...

Diagrams of neural activity in the hippocampus, recorded from a mouse as it learned about a new environment. Colors correspond to unique locations within the new space. Over time and continued exposure to the arena, the mouse forms stable memories by recruiting teams of neurons to encode for the location. 

Credit: Caltech

Via Medical Xpress:  How memories form and fade

Paper: Persistence of neuronal representations through time and damage in the hippocampus. (Science - paywalled; Preprint: bioRxiv - PDF)