Free will might be an illusion based on recent neuroscience studies

If you had chosen not to read this sentence, could you have actually done otherwise? This question lies at the heart of the **principle of alternative possibilities** (PAP), a cornerstone of the free will debate which asserts that an agent is morally responsible for an action only if they could have acted differently. While neuroscience suggests our brains decide before we do, philosophers have fought back by reimagining what it actually means to "have a choice" in a physical universe. ## Frankfurt Cases and the Illusion of Alternatives For centuries, libertarian free will relied on the intuitive idea of a "garden of forking paths"—the physical capability to choose path A or path B under identical starting conditions. However, in 1969, philosopher [Harry Frankfurt](https://en.wikipedia.org/wiki/Harry_Frankfurt) disrupted this assumption with a devastating thought experiment. Imagine an elector, Jones, who intends to vote for Candidate Democratic. Unbeknownst to him, a neuroscientist has implanted a microchip in his brain. If Jones decides to vote Democratic, the chip does nothing. But if Jones wavers and decides to vote Republican, the chip activates, forcing him to vote Democratic anyway. When the election occurs, Jones votes Democratic entirely on his own initiative; the chip remains dormant. In his seminal paper, [Alternate Possibilities and Moral Responsibility](https://www.jstor.org/stable/2105629), Frankfurt argued: > "A person may well be morally responsible for what he has done even though he could not have done otherwise." > — Harry Frankfurt Because Jones *wanted* to vote Democratic and acted on his own desire, we hold him responsible, even though the alternative path was a physical impossibility. This "Frankfurt Case" split the philosophical community, suggesting that freedom might not be about having open physical alternatives, but rather about the **source** of the action. If the action flows from your own desires, the lack of alternative pathways may not matter. ## The Conditional Analysis: What "Could Have" Actually Means To rescue the "ability to act otherwise" without defying physical laws, compatibilists like David Hume and contemporary philosopher Daniel Dennett proposed a **conditional analysis** of ability. When we say a computer *can* run a specific program, we do not mean it randomly chooses to do so. We mean that *if* we input the command, it will run. Similarly, to say you "could have chosen otherwise" simply means: **if** your past desires or the external circumstances had been slightly different, you **would** have chosen otherwise. Consider a professional golfer missing a short putt. To say "she could have made that putt" is not to claim she could rewrite the laws of physics under identical atomic conditions. Rather, it is a statement about her capacity: in a high percentage of similar, counterfactual scenarios, she succeeds. This perspective shifts the definition of free will from an impossible metaphysical sovereignty over physics to a highly evolved, flexible cognitive capacity for [counterfactual thinking](https://plato.stanford.edu/entries/historicist-justification/counterfactuals.html)—the brain's ability to model hypothetical futures to guide present behavior.

Regarding: "If the action flows from your own desires, the lack of alternative pathways may not matter."

Could you be a mere cog in a deterministic universe, yet still be entirely free? This provocative question lies at the heart of Thomas Hobbes’s pioneering defense of compatibilism—the philosophical position that free will and determinism are perfectly reconciled. For Hobbes, the common intuition that freedom requires "alternative pathways" (the ability to have done otherwise) is a profound misunderstanding. If your actions flow directly from your own internal desires, you are free, even if those desires were pre-determined by an unbroken chain of cause and effect. ## Defining Hobbesian Liberty To understand Hobbes's view, we must look to his classic definition of liberty in his 1651 masterpiece, [*Leviathan*](https://en.wikipedia.org/wiki/Leviathan_(book)). Hobbes defines freedom not as a metaphysical power of uncaused choice, but as the mere absence of external obstacles to motion. > "LIBERTY, or FREEDOM, signifieth, properly, the absence of opposition; (by opposition, I mean external impediments of motion;)... A FREE-MAN, is he, that in those things, which by his strength and wit he is able to do, is not hindered to do what he has a will to." In the Hobbesian framework, water flowing down a channel is "free" to descend because there is no dam blocking its path, even though gravity dictates it has no alternative route. Similarly, when you choose to drink a glass of water, your action is free if no one is physically forcing you to drink or preventing you from doing so. The fact that your biological thirst and your subsequent desire to drink were completely determined by prior physical causes is irrelevant to your freedom. ## The Stream Analogy and the Denial of Alternative Pathways Consider a modern analogy: a hiker walking down a narrow mountain crevice. The path has no forks; it leads to only one destination. If the hiker actively *wants* to reach that destination and walks there joyfully, are they free? To Hobbes, the answer is a resounding yes. The lack of alternative pathways does not matter because the action flows from the hiker's own internal desire (what Hobbes called "active appetites"). Hobbes debated this fiercely with Bishop John Bramhall in a series of famous polemics collected in [*The Questions Concerning Liberty, Necessity, and Chance*](https://plato.stanford.edu/entries/hobbes-moral/#FreNec). Bramhall argued that true agency requires "liberty of contrariety"—the genuine power to choose between A or B. Hobbes countered that such "liberty" is an illusion. Every volition is caused by a prior cause, which has its own cause, tracing back to the First Cause (God). ## Modern Echoes: Frankfurt Cases This Hobbesian insight heavily anticipates one of the most famous contemporary debates in action theory: [Frankfurt Cases](https://en.wikipedia.org/wiki/Frankfurt_cases), introduced by philosopher Harry Frankfurt in 1969. Frankfurt designed thought experiments showing that an agent can be morally responsible for an action even if they could not have done otherwise, provided the action aligned with their internal desires. Hobbes set the stage for this centuries earlier. By shifting the focus of free will from *metaphysical sourcehood* (being the uncaused first cause of your actions) to *voluntary action* (doing what you want to do without external hindrance), Hobbes reframed freedom. It is not about having multiple doors open to you; it is about gladly walking through the only door available because you want to see what is on the other side.

If citizens are just sophisticated water streams flowing down predetermined channels, is the "social contract" a rational choice or a mechanical inevitability? This connection pushes Hobbes’s physical determinism into his political philosophy, suggesting that the Sovereign does not convince citizens to obey, but rather alters their psychological environment so that obedience becomes the only unobstructed path. Exploring this dimension unlocks a startling view of political systems not as moral agreements, but as systems of psychological engineering. * **Primary Source:** [*De Cive* (On the Citizen)](https://en.wikipedia.org/wiki/De_Cive) by Thomas Hobbes, which lays bare the mechanistic construction of commonwealths before *Leviathan*. ## 2. Spinoza’s Stone: The Delusion of Consciousness and the Freedom of a Projectile What if your cherished sense of "voluntary desire" is actually a neurological trick played on you by your own ignorance? While Hobbes championed freedom as acting on internal desires, Baruch Spinoza took determinism to its absolute limit, arguing that we only think we are free because we are conscious of our actions but ignorant of the causes determining them. This perspective introduces a radical critique of Hobbes: your "gladly walking through the door" is not freedom, but a beautifully gilded cage of self-delusion. > "A stone receives from the impelling cause a certain quantity of motion... Think of this stone, now, as conscious... it will believe itself to be completely free, and to persist in motion for no other reason than that it wants to." > — Baruch Spinoza, [Letter 58 to G. H. Schuller](https://plato.stanford.edu/entries/spinoza/) ## 3. The Neurobiology of Volition: Do Brain Scans Validate Hobbesian Appetites? What if modern neuroscience proved that your brain decides to act seconds before your conscious mind even registers the desire? By reducing desires to "endeavours" (tiny, internal physical motions), Hobbes anticipated the materialist reduction of mind to brain. This bridge links 17th-century philosophy directly to modern neuroscience, specifically the famous Benjamin Libet experiments and subsequent fMRI studies showing that unconscious neural activity predicts choices before conscious awareness occurs, challenging whether "voluntary" desires are ever truly our own. * **Primary Source:** [*Mind Time: The Temporal Factor in Consciousness*](https://www.hup.harvard.edu/books/9780674018464) by Benjamin Libet, which details the empirical discovery of the "readiness potential." ## 4. The Theological Trap: If God Is the First Cause, Is He the Author of Sin? If every human choice is the inevitable result of a domino effect started by God, how can a just deity punish a sinner for doing exactly what they were designed to do? This was the explosive core of the Hobbes-Bramhall debate: the problem of moral accountability under an omnipotent First Cause. Investigating this angle unlocks the tense, high-stakes collision between early modern physics and Christian theology, revealing how Hobbes had to redefine the very nature of sin, punishment, and divine justice to keep his deterministic system from collapsing into heresy. * **Primary Source:** [*The Questions Concerning Liberty, Necessity, and Chance*](https://philpapers.org/rec/HOBTQC) by Thomas Hobbes and John Bramhall, specifically their heated exchanges on the origin of evil.