According to neuroscientists, when we stir up a long-term memory, it floats in our consciousness, unstable, for a window of approximately three hours. During this time, the memory is malleable. The present infiltrates the past. We add details to fill in the gaps. Then the brain re-encodes the memory as if it were new, writing over the old one. As it sinks back down into the depths of our minds, we are not even aware of what we have gained or lost, or why.
