The dialogical self is a psychological concept which describes the mind's ability to imagine the different positions of in an internal dialogue, in close connection with external dialogue. The "dialogical self" is the central concept in the Dialogical Self Theory (DST), as created and developed by the Dutch psychologist Hubert Hermans since the 1990s.
Dialogical Self Theory (DST) weaves two concepts, self and dialogue, together in such a way that a more profound understanding of the interconnection of self and society is achieved. Usually, the concept of self refers to something “internal,” something that takes place within the mind of the individual person, while dialogue is typically associated with something “external,” that is, processes that take place between people involved in communication.
The composite concept “dialogical self” goes beyond the self-other dichotomy by infusing the external to the internal and, in reverse, to introduce the internal into the external. As functioning as a “society of mind”, the self is populated by a of “self-positions” that have the possibility to entertain dialogical relationships with each other.
In Dialogical Self Theory (DST) the self is considered as “extended,” that is, individuals and groups in the society at large are incorporated as positions in the mini-society of the self. As a result of this extension, the self does not only include internal positions (e.g., I as the son of my mother, I as a teacher, I as a lover of jazz), but also external positions (e.g., my father, my pupils, the groups to which I belong).
Given the basic assumption of the extended self, the other is not simply outside the self but rather an intrinsic part of it. There is not only the actual other outside the self, but also the imagined other who is entrenched as the other-in-the-self. An important theoretical implication is that basic processes, like self-conflicts, self-criticism, self-agreements, and self-consultancy, are taking place in different domains in the self: within the internal domain (e.g., “As an enjoyer of life I disagree with myself as an ambitious worker”); between the internal and external (extended) domain (e.g., “I want to do this but the voice of my mother in myself criticizes me”) and within the external domain (e.g., “The way my colleagues interact with each other has led me to decide for another job”).