Abstract

Open peer commentary on the article “A Moving Boundary, a Plastic Core: A Contribution to the Third Wave of Extended-Mind Research” by Timotej Prosen. Abstract: Prosen’s conception of the extension and temporal transformation of the bounds of viability of a single cognitive agent can be fruitfully complemented with a Sellarsian account of language as rule-governed behavior. Specifically, language allows for the externalization of the organism’s model of its own bounds of viability into a collective model that is instantiated in concrete linguistic practices that follow norms of use. This externalization gives cognitive agents the resources to unframe from their evolved problem space, extend their bounds of viability and transform them through time.