Experiment #132 · Thought experiment

BonJour's Clairvoyant

A reliable belief-former who doesn't know they're reliable

Laurence BonJour · 1980 · Epistemology

First published: L. BonJour, "Externalist Theories of Empirical Knowledge", *Midwest Studies in Philosophy* 5 (1980): 53–73.

Norman reliably forms true beliefs about the President's location via clairvoyance, with no idea his clairvoyance is reliable. Does he know?

Norman has a clairvoyant faculty that, unbeknownst to him, reliably produces true beliefs about the President's location. He has no evidence of his reliability and would be unable to defend his beliefs if challenged. By externalist reliabilist criteria, his beliefs are knowledge — they are produced by a reliable process. The intuition that they are not knowledge motivates internalist epistemology: knowledge requires that the subject have some kind of cognitive access to the grounds of belief, not merely that the process be reliable. The case is central to the internalism/externalism debate.

Formulation

Norman has clairvoyant faculty F producing reliable beliefs about p. Norman has no evidence about F's reliability or operation. Reliabilism: Norman knows p. Intuition: Norman does not know p. Conclusion: reliable belief-formation is not sufficient for knowledge.

Compare this experiment

Dimensions Engaged

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Observer

Observer · Knowledge Extent: must a knower have epistemic access to the grounds of their own knowledge?

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Information

Bears on whether reliable information transfer is sufficient for knowledge.

Responses — How Schools Engage

Affirms / takes the bait 3

Rationalism

A vindication of internalism: knowledge requires reflective access to grounds. Norman, lacking this, does not know.

Phenomenology

Genuine knowledge is constitutively first-personal; reliable mechanisms without first-person endorsement are not knowledge in any robust sense.

Pyrrhonism

A clean case of how thin the basis for "knowledge" attributions is once we look closely. Suspension of judgement remains warranted.

Reframes the question 2

Naturalism

Sophisticated reliabilism (process-virtue reliabilism, agent reliabilism) handles the case by requiring not just reliability but also integration into the agent's cognitive architecture.

Pragmatism

Knowledge is socially situated; Norman's isolation from any community-validated belief-forming practice is what makes his clairvoyance epistemically problematic.

Holds it inconclusive 1

Analytic Metaphysics / Logical Atomism

Live debate: internalists (BonJour, Chisholm) treat the case as decisive; externalists (Goldman, Sosa) bite the bullet or refine reliabilism.

Related Experiments

Experiments engaged by an overlapping set of schools — likely to surface the same fault lines.

Further reading

BonJour (1980), op. cit.
Goldman, *Epistemology and Cognition* (1986)

Related Historical Debates

Debates that share dimensions and/or aligned schools with this experiment.

The Newton–Hooke Disputes

1675–1686 · 2 shared dims · 4 shared schools

Wittgenstein vs Russell

1911 (first meeting); 1929 onward (sustained break) · 2 shared dims · 4 shared schools

Mill vs Whewell on Induction

1837–1872 · 2 shared dims · 4 shared schools

Carnap–Quine on Analyticity

1936–1951 · 2 shared dims · 3 shared schools

Carnap vs Heidegger on Metaphysics

1929–1932 · 2 shared dims · 3 shared schools

1739 / 1781 · 1 shared dim · 5 shared schools

Personas Most Aligned With This Experiment

Ranked by total declared-influence weight in the schools that respond to this experiment.

1859–1938 · 75% in phenomenology

Willard Van Orman Quine

1908–2000 · 40% in naturalism

Robert Stalnaker

1940– · 40% in analytic-metaphysics

Sextus Empiricus

c. 160–210 CE · 80% in pyrrhonism

1902–1994 · 30% in analytic-metaphysics

1932– · 35% in analytic-metaphysics

Bertrand Russell

1872–1970 · 40% in analytic-metaphysics

c. 360–c. 418 · 30% in rationalism

Works Most Aligned With This Experiment

Ranked by total declared-influence weight in the schools that respond to this experiment.

Outlines of Pyrrhonism

Sextus Empiricus · c. 200 CE · 85% in pyrrhonism

Cartesian Meditations

Edmund Husserl · 1929 (Sorbonne lectures); 1931 (French publication); 1950 (German publication) · 65% in phenomenology

Outlines of Pyrrhonism

Sextus Empiricus · c. 160–210 AD · 65% in pyrrhonism

Two Dogmas of Empiricism

Willard Van Orman Quine · 1951 (Philosophical Review) · 35% in analytic-metaphysics

Discourse on the Method

René Descartes · 1637 (published anonymously as the preface to three scientific essays — Optics, Meteorology, Geometry) · 40% in rationalism

Empiricism and the Philosophy of Mind

Wilfrid Sellars · 1956 · 30% in analytic-metaphysics

John Searle · 1983 · 30% in analytic-metaphysics

Convention: A Philosophical Study

David Lewis · 1969 (Harvard UP; based on his 1967 Harvard PhD dissertation under W. V. O. Quine) · 25% in analytic-metaphysics

Related Films

Films engaging the same dimensions as this experiment.

2016 · dir. Denis Villeneuve · 2 shared dims

1999 · dir. The Wachowskis · 2 shared dims

2014 · dir. Alex Garland · 2 shared dims

1983 · dir. Chris Marker · 2 shared dims

Related Contemporary Dilemmas

Dilemmas that engage the same dimensions as this experiment.

Could an AI have a mind that matters?

What happens to "you" when you die?

Do animals have moral standing comparable to humans?

Could a fetal brain organoid in a petri dish be conscious?

Is the late-stage dementia patient still the person their spouse married?

Should we edit the human germline?

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