The notion that we use external signs to think with is uncontentious when signs are typically symbolic (which can be described as borderline cases), such as maps and diagrams, algebraic notations, written systems, etc. But the morphological space of semiotic events and processes in which cognitive systems are embedded always include intermediary and mixed classes of signs.
The semiotic part of a theory of thinking with external resources should provide the formal and analytic tools for evaluating why certain things can function as signs that can be thought with. Peirce’s semiotics offers a highly consistent framework to investigate the use of different kinds of signs in cognitive processes. Peirce’s broad ideas concerning different types of signs and inferences are an important tool for advancing in the development of an externalist theory of mind. His treatment suggests that a reconsideration of the embodied-situated paradigm’s own philosophical foundations can behave in semiotic terms. Peircean semiotic theory of mind neither restricts representations to symbolic semiosis and inferential processes to deduction and induction as in orthodox representationalism, nor rejects representations as in anti-representationalism.
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João Queiroz & Pedro Atã