Memory is not a hard drive: it's a stage play

Jonah Lehrer covers memory in Wired.

I can recall vividly the party for my eighth birthday. I can almost taste the Baskin-Robbins ice cream cake and summon the thrill of tearing wrapping paper off boxes of Legos. This memory is embedded deep in my brain as a circuit of connected cells that I will likely have forever. Yet the science of reconsolidation suggests that the memory is less stable and trustworthy than it appears. Whenever I remember the party, I re-create the memory and alter its map of neural connections. Some details are reinforced—my current hunger makes me focus on the ice cream—while others get erased, like the face of a friend whose name I can no longer conjure. The memory is less like a movie, a permanent emulsion of chemicals on celluloid, and more like a play—subtly different each time it’s performed. In my brain, a network of cells is constantly being reconsolidated, rewritten, remade. That two-letter prefix changes everything.

And now there are drugs that can alter reconsolidation. This is great news for people with PTSD and traumatic memories. It's unnerving for those afraid dictators can use it to erase the memory of genocide.