Dialogical self
Inspired by the original ideas of William James and Mikhail Bakhtin, Hubert Hermans, Harry Kempen and Rens van Loon wrote the first psychological publication on the "dialogical self" in which they conceptualized the self in terms of a dynamic multiplicity of relatively autonomous "I"-positions in the (extended) landscape of the mind. In this conception, the "I" has the possibility to move from one spatial position to another in accordance with changes in situation and time. The "I" fluctuates among different and even opposed positions, and has the capacity to imaginatively endow each position with a voice so that dialogical relations between positions can be established. The voices function like interacting characters in a story, involved in processes of question and answer, agreement and disagreement. Each of them have a story to tell about their own experiences from their own stance. As different voices, these characters exchange information about their respective Me's and mines, resulting in a complex, narratively structured self.
Dialogue
The Platonic dialogue, as a distinct genre which features Socrates as a speaker and one or more interlocutors discussing some philosophical question, experienced something of a rebirth in the 20th century. Authors who have recently employed it include George Santayana, in his eminent "Dialogues in Limbo" (1926, 2nd ed. 1948; this work also includes such historical figures as Alcibiades, Aristippus, Avicenna, Democritus, and Dionysius the Younger as speakers). Also Edith Stein and Iris Murdoch used the dialogue form. Stein imagined a dialogue between Edmund Husserl (phenomenologist) and Thomas Aquinas (metaphysical realist). Murdoch included not only Socrates and Alcibiades as interlocutors in her work "Acastos: Two Platonic Dialogues" (1986), but featured a young Plato himself as well. More recently Timothy Williamson wrote "Tetralogue", a philosophical exchange on a train between four people with radically different epistemological views.