Empiricism is a family of positions in epistemology that assigns experience a fundamental role in the acquisition of knowledge, the formation of concepts, or the justification of beliefs. Experience generally includes sensory perception and, in some accounts, awareness of the mind’s own activities. Empiricism contrasts with rationalism, which holds that reason can independently supply certain concepts or substantive knowledge. The disagreement concerns the sources and limits of cognition, not whether reasoning is useful: empiricists ordinarily recognize an essential role for inference and conceptual organization. (plato.stanford.edu)
Principal forms and distinctions
Concept empiricism holds that concepts ultimately derive from experience, even when imagination combines them into representations of things never encountered. Knowledge empiricism concerns the dependence of knowledge on experience; justificatory empiricism concerns the experiential grounds that warrant beliefs. These claims are distinguishable: an account of how a belief originates does not automatically establish its epistemic justification. Empiricism may also be restricted to a particular domain rather than applied to every kind of knowledge. (plato.stanford.edu)
A central issue is how empiricism accommodates logic and mathematics. Many empiricists allow knowledge independent of experience, or a priori knowledge, while denying that it reveals substantive facts about the world. Logical empiricists, for example, explained logical and mathematical truths through linguistic rules or analyticity rather than observation. Empiricism therefore need not assert that every true proposition is discovered by inspecting particular events. (plato.stanford.edu)
Early modern development
Francis Bacon helped establish an influential program of experimental inquiry. In Novum Organum (1620), he opposed premature generalization and proposed systematic comparison of cases, including negative instances, to identify the causes of natural phenomena. His inductive reasoning was intended to move beyond simple enumeration toward the exclusion of inadequate explanations. This methodological program is related to, but distinct from, later theories about the experiential origins of ideas. (plato.sydney.edu.au)
John Locke presented an influential account in An Essay Concerning Human Understanding. Rejecting innate principles and ideas, he identified two sources of ideas: sensation, through which external objects affect the senses, and reflection, through which the mind apprehends its own operations, such as thinking, doubting, and willing. The mind receives simple ideas but actively combines, compares, and abstracts them to produce complex ideas. Locke’s position thus does not describe cognition as merely passive recording. (web.stanford.edu)
George Berkeley developed a different account in A Treatise Concerning the Principles of Human Knowledge (1710). He rejected material substance understood as existing independently of perception, arguing that sensible objects consist of ideas perceived by minds. His immaterialism nevertheless affirmed the existence of active spirits and God. Berkeley illustrates why an empiricist theory of cognition does not necessarily entail materialism or rejection of metaphysics. (plato.stanford.edu)
David Hume distinguished vivid impressions from less vivid ideas and proposed that simple ideas copy corresponding impressions. Complex ideas arise through combinations and associations. He distinguished relations of ideas, exemplified by mathematical reasoning, from matters of fact, whose opposites remain conceivable. These distinctions supported his examination of the limits of claims about the external world and causation. (plato.stanford.edu)
The conventional grouping of Locke, Berkeley, and Hume as “British empiricists” is useful but imperfect. Their accounts of substance, mind, religion, and knowledge differ substantially. Likewise, philosophers traditionally classified as rationalists also assigned important roles to experience; the two labels should not be treated as exhaustive descriptions of complete philosophical systems. (plato.stanford.edu)
Induction and the limits of experience
Hume’s problem of induction concerns the justification of moving from observed cases to unobserved cases. Previous regularities do not logically guarantee future regularities. Appealing to the past success of induction appears circular because it already assumes that past patterns support expectations about the future. Hume explained our tendency to make such inferences through custom or habit. The problem challenges the rational foundations of prediction rather than simply recommending the abandonment of empirical inquiry. (plato.stanford.edu)
Immanuel Kant responded by distinguishing knowledge that begins with experience from knowledge derived entirely from experience. He argued that experience requires forms of sensibility and categories of understanding that are not themselves extracted from sensations. His account challenged attempts to explain objective knowledge solely through accumulated impressions, while restricting legitimate theoretical knowledge to objects of possible experience. (plato.stanford.edu)
Twentieth-century reformulations
Logical empiricism, associated with the Vienna Circle, the Berlin group, and philosophers including Rudolf Carnap, joined an emphasis on empirical evidence with formal analysis of scientific language. Its participants investigated meaning, confirmation, probability, and the relationship between observation and theory. Although often identified with logical positivism, the movement contained diverse positions and did not maintain one unchanging verification criterion. (plato.stanford.edu)
Willard Van Orman Quine challenged its reliance on a sharp analytic–synthetic distinction. His alternative emphasized the interconnected character of beliefs and continuity between philosophy and empirical science. Wilfrid Sellars criticized the “myth of the given”: the assumption that uninterpreted sensory awareness can independently provide a foundation for knowledge. For Sellars, a sensation’s occurrence and its capacity to justify a claim are different matters; empirical knowledge depends on conceptual and inferential capacities. (plato.stanford.edu)
Empiricism and scientific theories
In philosophy of science, constructive empiricism, presented in Bas van Fraassen’s The Scientific Image (1980), distinguishes accepting a theory from believing that everything it says is true. Acceptance requires belief in empirical adequacy: correctness about observable phenomena. Unlike scientific realism, it does not require belief in the theory’s claims about unobservable entities, although it interprets those claims literally rather than dismissing them as meaningless. Its central questions include how observability should be defined and whether empirical adequacy sufficiently characterizes scientific acceptance. (plato.stanford.edu)