["Mind &Language, EarlyView. ", "\nThe idea that cognition involves dialogic interchange between mutually influencing “voices” has long featured in psychology and philosophy. While dialogic structure is most explicit in inner speech, some authors have argued that other types of mental activity can be (or always are) dialogic. We introduce two dimensions of dialogism, strength and depth, and characterize a particularly deep form of dialogism of the mind. We offer a developmental interpretation of deep dialogism and show how this form of dialogism has important payoffs for explaining the mechanisms and the phenomenology of human psychological experiences in general and mental health conditions in particular.\n"]