Philosophy of Mind Part 8: Free Will

The Dilemma

The classic argument is brutally simple. Either determinism is true (every event is fully determined by prior causes plus the laws of nature) or it is false. If determinism is true, then your "choices" were fixed by the state of the universe a billion years ago. If determinism is false, then some events are uncaused — random — and randomness is no better foundation for genuine agency than determinism. So in either case, no free will. This is the standard argument against free will.

Three families of responses fight back: hard determinists accept the conclusion; libertarians reject the second horn (claiming undetermined choices can still be agential); compatibilists reject the first horn's bite (claiming determinism is no obstacle to the only freedom worth wanting).

Hard Determinism

Held famously by Baron d'Holbach in the Enlightenment, refined by Sam Harris and Galen Strawson in our era. Free will is an illusion produced by ignorance of our causal antecedents. Strawson's "Basic Argument": to be truly responsible for an action, you must be responsible for the kind of person you were when you performed it; but you are who you are because of factors (genes, upbringing, prior experiences) you did not choose; therefore ultimate responsibility is impossible.

The practical implications are large: retributive punishment becomes ill-grounded; gratitude and resentment, in their strongest forms, become misdirected. The hard determinist asks us to reform our practices, not abolish them.

Libertarian Free Will

Libertarians (no relation to political libertarianism) deny universal determinism and locate free choices in the indeterminacy. Roderick Chisholm proposed agent causation: a free act is caused not by another event but by the agent qua substance — a sort of "uncaused causer" within the agent.

Robert Kane, in The Significance of Free Will (1996), tried to make libertarianism naturalistic. Some choices — "self-forming actions" — occur in moments of genuine indeterminacy in the brain, where competing motives are roughly balanced. The agent's effort to choose between them tilts the outcome but does not determine it. The randomness, Kane argued, is at the right level (decision-making) to constitute, not undermine, agency.

Critics doubt that subatomic-level indeterminacy reaches up to choices, and worry the view leaves the choice ultimately unexplained.

Compatibilism

The dominant view among contemporary philosophers. Compatibilists argue that free will, properly understood, is not opposed to determinism at all. David Hume articulated the classical version: liberty is the power of acting according to the determinations of one's will. A prisoner is not free; a person walking down the street is. The relevant question is not whether choice was caused, but by what.

Frankfurt's Hierarchical Theory

Harry Frankfurt, in "Freedom of the Will and the Concept of a Person" (1971), proposed that free will requires hierarchical structure: first-order desires (to drink, to smoke), and second-order desires (to want to want, or to want not to want). A person acts freely when their first-order desire is endorsed by a second-order desire — the addict who wishes she didn't want the drug acts unfreely; the willing addict who wholeheartedly endorses her craving acts freely (in this technical sense).

P.F. Strawson's Reactive Attitudes

P.F. Strawson's "Freedom and Resentment" (1962) reframed the debate entirely. Look at our actual practices of gratitude, resentment, indignation, love, hurt — the "reactive attitudes." These are inseparable from human relationships. The question is not whether determinism makes them strictly justified but whether we could (or should) abandon them. Strawson: no — they are constitutive of treating one another as persons, not as objects to be managed. Free will is grounded in this practical inescapability.

Frankfurt Cases

Libet & Modern Neuroscience

Benjamin Libet's famous 1983 experiments asked subjects to spontaneously flex a wrist whenever they wanted, while EEG and a clock recorded the timing. Results: a "readiness potential" in the brain preceded the conscious intention to move by roughly 350-500 milliseconds. The brain seemed to be initiating the action before the conscious self decided.

Soon, Brass, Heinze, and Haynes (2008) extended this dramatically: using fMRI, they could predict which of two buttons a subject would press up to 10 seconds before the subject reported deciding. Free will appears to lose ground rapidly.

Where do we land? Most contemporary philosophers are some kind of compatibilist; most neuroscientists who comment publicly lean hard-determinist; libertarians persist as a vocal minority. The honest answer in 2026 is that the question is open — and that whatever its metaphysical resolution, our practices of holding each other responsible appear pragmatically irreplaceable.