Tim Klapdor explores the concept of self, paticu;arly with respect to identity and learning. It's a complex issue. At first blush we think we have one self, but then everyone can think of an instance when we were (if you will) "not ourselves". Klapdor explores "Jung... the anima/animus (male/female). This underlying unconscious mind helped balance and maintain the persona..." Except that's too simple as well. There's the mental self, the bodily self, the public self, the historical self - I could go on; the list is almost endless. Philosophy is full of thought experiments designed to test the concept (if I take my brain and put it in your body, is the resulting person me or you?).