Cognitivism vs Non-Cognitivism in Metaethics

Direct Answer

The debate between cognitivism and non-cognitivism is a debate about what kind of mental state moral judgments express. Cognitivism holds that moral judgments express beliefs. A belief is a mental state that aims to represent the world accurately and that can be assessed as true or false. If I judge that stealing is wrong, I believe that stealing has the property of wrongness, and my judgment is true just in case stealing really does have that property. Non-cognitivism denies this. It holds that moral judgments express mental states that are not beliefs — emotions, attitudes, or prescriptions — and that these states are not truth-apt in the way beliefs are. On the emotivist version of non-cognitivism, judging that stealing is wrong is more like disapproving of stealing than like believing a fact about it. The two theories agree that moral language is meaningful; they disagree about what kind of meaning it has. The issue is foundational because it determines whether moral claims can be true or false at all, and hence whether there can be such a thing as moral knowledge.

Historical Context

The debate emerged in its modern form in the early twentieth century. Cognitivism had been the default assumption of the tradition: Plato, Aristotle, and G.E. Moore all treated moral judgments as beliefs about moral properties, whatever they took those properties to be. The challenge came from David Hume, who argued that morality is more a matter of sentiment than of reason, and from the logical positivists, who made the verification principle the test of factual meaning. If a sentence cannot in principle be verified or falsified by experience, the positivists argued, it does not state a fact — and moral sentences, they claimed, fail this test. A.J. Ayer drew the conclusion in Language, Truth and Logic (1936): moral sentences express emotions, not facts, and are therefore neither true nor false. C.L. Stevenson developed this into emotivism proper, and R.M. Hare later proposed prescriptivism, a non-cognitivist theory according to which moral judgments express universalizable prescriptions. For much of the mid-twentieth century, non-cognitivism was the orthodoxy of analytic metaethics, until the realist revival of the 1980s and the development of "cognitivist expressivism" in the decades since.

Key Arguments & Debates

The cognitivist case rests on the phenomenology and logic of moral thought. Morality feels like belief: we take moral claims to be true, we argue about them as if they concerned the world, and we treat moral error as a kind of ignorance rather than a difference of taste. Cognitivists also point to moral logic: "If stealing is wrong, then getting your little brother to steal is wrong" is a valid argument that embeds a moral judgment in a conditional. Non-cognitivists struggle to explain how emotional expressions can participate in logical inference — this is the Frege-Geach problem, the deepest challenge to their view. The non-cognitivist case rests on moral motivation: moral judgments seem intrinsically motivating in a way that ordinary beliefs are not, and the emotivist explains this by saying the judgment just is an attitude. Non-cognitivists also appeal to moral disagreement: if moral judgments were beliefs about facts, disagreements should be resolvable by investigation, yet many moral disagreements seem to be differences of attitude. The debate continues in sophisticated forms, with contemporary expressivists such as Simon Blackburn and Allan Gibbard attempting to reconcile non-cognitivism with moral logic.

Contemporary Relevance

The debate is not merely academic. When people say that moral disputes are "just about feelings," they are endorsing non-cognitivism; when they insist that moral claims can be "objectively true or false," they are endorsing cognitivism. The question recurs in applied contexts: in arguing about human rights, animal ethics, or AI alignment, the status of moral claims — beliefs about facts or expressions of attitude — determines whether moral reasoning can be expected to converge the way scientific reasoning does. The debate also shapes moral education and public discourse: a cognitivist treats moral improvement as the correction of error, while a non-cognitivist treats it as the reshaping of attitudes.

Related Concepts

This debate sits at the heart of metaethics. Emotivism is the classic non-cognitivist theory, and prescriptivism is its most sophisticated successor; both are forms of non-cognitivism more broadly. The cognitivist side connects to moral realism, since realism requires that moral judgments be truth-apt, while the debate as a whole feeds the larger contest between moral realism and anti-realism.

Further Learning

The Stanford Encyclopedia of Philosophy entry on moral cognitivism provides a rigorous survey. The Internet Encyclopedia of Philosophy's comparison of cognitivism and non-cognitivism is a good starting point. A.J. Ayer's Language, Truth and Logic (1936) states the emotivist position in its purest form, and Mark Schroeder's Noncognitivism in Ethics (Routledge, 2010) is the best modern treatment.