transcendental argument an argument that elucidates the conditions for the possibility of some fundamental phenomenon whose existence is unchallenged or uncontroversial in the philosophical context in which the argument is propounded. Such an argument proceeds deductively, from a premise asserting the existence of some basic phenomenon (such as meaningful discourse, conceptualization of objective states of affairs, or the practice of making promises), to a conclusion asserting the existence of some interesting, substantive enabling conditions for that phenomenon. The term derives from Kant’s Critique of Pure Reason, which gives several such arguments. The paradigmatic Kantian transcendental argument is the ‘Transcendental Deduction of the Pure Concepts of Understanding.’ Kant argued there that the objective validity of certain pure, or a priori, concepts (the ‘categories’) is a condition for the possibility of experience. Among the concepts allegedly required for having experience are those of substance and cause. Their apriority consists in the fact that instances of these concepts are not directly given in sense experience in the manner of instances of empirical concepts such as red. This fact gave rise to the skepticism of Hume concerning the very coherence of such alleged a priori concepts. Now if these concepts do have objective validity, as Kant endeavored to prove in opposition to Hume, then the world contains genuine instances of the concepts. In a transcendental argument concerning the conditions for the possibility of experience, it is crucial that some feature entailed by the having of experience is identified. Then it is argued that experience could not have this feature without satisfying some substantive conditions. In the Transcendental Deduction, the feature of experience on which Kant concentrates is the ability of a subject of experience to be aware of several distinct inner states as all belonging to a single consciousness. There is no general agreement on how Kant’s argument actually unfolded, though it seems clear to most that he focused on the role of the categories in the synthesis or combination of one’s inner states in judgments, where such synthesis is said to be required for one’s awareness of the states as being all equally one’s own states. Another famous Kantian transcendental argument – the ‘Refutation of Idealism’ in the Critique of Pure Reason – shares a noteworthy trait with the Transcendental Deduction. The Refutation proceeds from the premise that one is conscious of one’s own existence as determined in time, i.e., knows the temporal order of some of one’s inner states. According to the Refutation, a condition for the possibility of such knowledge is one’s consciousness of the existence of objects located outside oneself in space. If one is indeed so conscious, that would refute the skeptical view, formulated by Descartes, that one lacks knowledge of the existence of a spatial world distinct from one’s mind and its inner states.
Both of the Kantian transcendental arguments we have considered, then, conclude that the falsity of some skeptical view is a condition for the possibility of some phenomenon whose existence is acknowledged even by the skeptic (the having of experience; knowledge of temporal facts about one’s own inner states). Thus, we can isolate an interesting subclass of transcendental arguments: those which are anti-skeptical in nature. Barry Stroud has raised the question whether such arguments depend on some sort of suppressed verificationism according to which the existence of language or conceptualization requires the availability of the knowledge that the skeptic questions (since verificationism has it that meaningful sentences expressing coherent concepts, e.g., ‘There are tables’, must be verifiable by what is given in sense experience). Dependence on a highly controversial premise is undesirable in itself. Further, Stroud argued, such a dependence would render superfluous whatever other content the anti-skeptical transcendental argument might embody (since the suppressed premise alone would refute the skeptic). There is no general agreement on whether Stroud’s doubts about anti-skeptical transcendental arguments are well founded. It is not obvious whether the doubts apply to arguments that do not proceed from a premise asserting the existence of language or conceptualization, but instead conform more closely to the Kantian model. Even so, no anti-skeptical transcendental argument has been widely accepted. This is evidently due to the difficulty of uncovering substantive enabling conditions for phenomena that even a skeptic will countenance.
See also KANT, SKEPTICIS. A.B.