Classical theories of cognitive processing have defended a propositional approach to mental information processing. Because not all cognitive processes offer the systematicity proper to these types of languages, other theories have proposed a more iconic or associative approach. These types of representational systems do not seem to possess such a systematic structure. But this is debatable. In a semiotic perspective, it can be shown that these systems can be modelled in a categorial approach and hence render more explicit their underlying systematicity. It then follows that a propositional language is not the only language that offers the systematicity required for coherent information processing.
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