"Our memories are in part reconstructions. Whenever we retrieve a memory, the brain rewrites it a bit, updating the past according to our present concerns and understanding. At the cellular level, LeDoux explains, retrieving a memory means it will be "reconsolidated," slightly altered chemically by a new protein synthesis that will help store it anew after being updated.40 Thus each time we bring a memory to mind, we adjust its very chemistry: the next time we retrieve it, that memory will come up as we last modified it. The specifics of the new consolidation depend on what we learn as we recall it. If we merely have a flare-up of the same fear, we deepen our fearfulness. But the high road can bring reason to the low. If at the time of the fear we tell ourselves something that eases its grip, then the same memory becomes reencoded with less power over us. Gradually, we can bring the once-feared memory to mind without feeling the rush of distress all over again. In such a case, says LeDoux, the cells in our amygdala reprogram so that we lose the original fear conditioning.41 One goal of therapy, then, can be seen as gradually altering the neurons for learned fear."