As an infant develops a more complex experiential field, as a result of more interactions with other people, one part of his or her experience becomes differentiated from the rest. This new and separate part is defined by the words I,me,and myself. It is the self or self-concept, and it involves distinguishing what is directly and immediately part of oneself from what is external to oneself. The self-concept is the person's picture or image of what he or she is, should be, and might like to be.