I think Dexter is a man who, a part of himself is very much frozen, or arrested in a place that is pre-memory, pre-conscious, pre-verbal. Something very traumatic happened to him, he doesn`t know what that is. And I think on some level he wants to know. He denies his humanity, he describes himself as someone who is without feeling, and yet I think that he maybe suspects - in a way that maybe isn`t even conscious yet when we first meet him - that he is in fact a human being.