How does the brain store memories? What happens each time we recall a memory?

Question: How does the brain store memories? What happens each time we recall a memory?
- Keywords:
  neuroscience
Asked by totoro to Andrew, Katie, Sadaf on 27 Jun 2013.
- Andrew Swale answered on 27 Jun 2013:
  
  In psychology A level I learnt about varying theories for memory and how it functions etc – therefore I guess the answer differs depending on the theory of memory

Question: How does the brain store memories? What happens each time we recall a memory?