Definition
Empiricism (Locke) holds that all knowledge derives from sensory experience. Its scientific form, inductivism, claims that general laws are derived by generalizing from repeated observations. Deutsch argues this is fundamentally mistaken and has historically impeded the growth of knowledge.
Why It Matters
Sensory experience is an unreliable foundation for knowledge because our data is always interpreted through prior, often hidden, theoretical filters. Recognizing the limits of empiricism prevents the “inductivism trap,” forcing us to rely on bold, creative conjectures that can be tested rather than waiting for data to “speak for itself.”
Core Concepts
- The empiricist claim: Knowledge = justified belief derived from experience. Locke’s tabula rasa — the mind starts blank and is written on by sensation.
- Inductivism: The view that science works by observing many instances and inferring a general law. E.g., observe many white swans → conclude all swans are white.
- Hume’s problem of induction: No number of positive observations logically entails a universal conclusion. Induction cannot be rationally justified. Empiricists have never solved this.
- Deutsch’s critiques:
- Most scientific knowledge concerns unobservable entities (quarks, other galaxies, the multiverse, past events) — not experience at all.
- There is no reason the future should resemble the past; induction has no logical foundation.
- No observation is theory-free — all data is interpreted through prior theoretical frameworks (see Theory-Ladenness of Observation).
- Empiricism leads to justificationism: it replaces ‘God told us’ with ‘our senses tell us’ as the ultimate authority — still an appeal to infallible authority.
- The authority problem: Empiricism is supposed to escape authority by grounding knowledge in raw experience. But experience is not self-interpreting. The same data can support wildly different theories.
- Science is not induction: Science is bold conjecture + criticism + test. Theories are not derived from data — they are invented by creative thought and then checked against data.
- Empiricism was historically valuable: It challenged religious and traditional authority. Its emphasis on observation over dogma was a salutary correction — but its own epistemological theory is wrong.