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Hardcover | $54.00 Short | £44.95 | 376 pp. | 6 x 9 in | 25 b&w illus. | April 2016 | ISBN: 9780262034234
eBook | $38.00 Short | June 2016 | ISBN: 9780262333610
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Cognitive Pluralism


Philosophers have traditionally assumed that the basic units of knowledge and understanding are concepts, beliefs, and argumentative inferences. In Cognitive Pluralism, Steven Horst proposes that another sort of unit—a mental model of a content domain—is the fundamental unit of understanding. He argues that understanding comes not in word-sized concepts, sentence-sized beliefs, or argument-sized reasoning but in the form of idealized models and in domain-sized chunks. He argues further that this idea of “cognitive pluralism”—the claim that we understand the world through many such models of a variety of content domains—sheds light on a number of problems in philosophy.

Horst first presents the “standard view” of cognitive architecture assumed in mainstream epistemology, semantics, truth theory, and theory of reasoning. He then explains the notion of a mental model as an internal surrogate that mirrors features of its target domain, and puts it in the context of ideas in psychology, philosophy of science, artificial intelligence, and theoretical cognitive science. Finally, he argues that the cognitive pluralist view not only helps to explain puzzling disunities of knowledge but also raises doubts about the feasibility of attempts to “unify” the sciences; presents a model-based account of intuitive judgments; and contends that cognitive pluralism favors a reliabilist epistemology and a “molecularist” semantics. Horst suggests that cognitive pluralism allows us to view rival epistemological and semantic theories not as direct competitors but as complementary accounts, each an idealized model of different dimensions of evaluation.

About the Author

Steven Horst is Professor of Philosophy at Wesleyan University. He is the author of Laws, Mind, and Free Will (MIT Press).


Horst provides a masterful, comprehensive defense of the idea that almost every part of philosophy changes once we recognize the importance of mental models for our cognition. Anyone working in philosophy of mind, language, or epistemology will need to engage with his ideas and arguments.
David Danks, Professor of Philosophy and Psychology, Carnegie Mellon University; author of Unifying the Mind: Cognitive Representations as Graphical Models
In a series of impressive books, Steven Horst has been educating the philosophical community about how to think rigorously about cognition. In this volume, he sets out a comprehensive theory of cognitive architecture and cognition, scouting its implications for methodology in cognitive science, for epistemology, and for semantics. The account is meticulously anchored in important empirical work and is defended with rigor, clarity, and elegance of exposition. The pluralism Horst develops is highly original and runs against the grain of much contemporary systematic thought in philosophy of mind today about the structure of the mind. So much the worse for orthodoxy; Horst’s view is by far the most compelling and carefully articulated on offer.
Jay L. Garfield, Kwan Im Thong Hood Cho Temple Professor of Humanities, Yale-NUS College; Doris Silbert Professor in the Humanities and Professor of Philosophy, Smith College