The brain stores memories in different ways. Short term memories, where you left the keys, the name of the girl you picked up at the bar last night, are managed by the hippocampus. But the hippocampus doesn’t keep them for long. It kicks them out into the cortex where they strengthen or weaken depending on how often you visit them. Everytime you access a memory, neurons are activated and that memory grows stronger. But ignoring a memory for too long, you may loose it forever. – Dr. Daniel Pierce