The brain repurposes, represents, reformats, reconfigures over time. The person we are each day is dependent on this; indeed, we are never ever quite the same self despite the sense of continuity of self that we assert.
There is an important point here. The only way we know how we change is to do something to fix a baseline of previous experience. We need to do a 'calibration curve' for the changing brain. And that requires us to journal, to blog, to self-record. That's why I'm writing all this.