Two aspects of dialectical psychology are considered: (1) The synthesis of a larger cognitive system from two previously separate parent systems; this leads to a consideration of how each parent system may undergo accommodation and assimilation as a result of synthesis. (2) A demonstration of how and why dialogue undergoes continual change with occasional eruptions of logical contradictions; this is done by modelling dialogue in terms of concepts from general systems theory. In demonstrating this, the following theoretical extensions are achieved: the development of a propositional social logic, the representation of dialogue case information using Fillmore’s cases, the hypothesis that children are instructed via dialogue to approximate the structure of inquiring systems, the generalization of Rescher’s theory of logical contradiction by introducing a ‘clinical’ distinction between deep and surface propositional beliefs, and the merging of gesture with verbal propositions to extend the scope of dialogue’s structure and
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