Lecture 5: Arguments for the Soul, Part III: Free Will and Near-Death Experiences

What this lecture covers

This lecture finishes the free-will argument for the soul begun last time, showing that each of its three premises can be challenged on philosophical or scientific grounds. It then shifts from everyday features of people to supernatural evidence, evaluating near-death experiences as a possible argument for the existence of a soul. Finally, it introduces a completely different kind of argument, Descartes's thought experiment about imagining the mind existing without the body.

After watching, you should be able to state the free-will argument's three premises and why each is contestable, explain why Kagan finds the near-death-experience argument unpersuasive without dismissing the experiences themselves, and understand the logical structure of Descartes's imagination argument for mind-body distinctness.

Key ideas

• Determinism: the view that given a system's initial state and the laws of nature, only one outcome could follow; often assumed to conflict with free will.
• Premise 1 challenged: some philosophers deny we have free will at all, treating it as an illusion, which would block the argument from the start.
• Premise 3 challenged: the standard interpretation of quantum mechanics suggests fundamental physics is probabilistic, not deterministic, so not all physical systems are subject to determinism.
• Compatibilism: Kagan's own view, that free will and determinism are not actually incompatible, which undercuts premise 2 of the argument.
• Inference to the best explanation applied to the supernatural: near-death experiences, séances and ghost stories can all be framed as evidence that supposedly requires a soul to explain.
• The 'two-room' vs. 'one-room' explanation: near-death experiences can be read either as glimpses of an afterlife (soul leaving the body) or as unusual biological processes (like endorphin release) occurring as the body nears death.
• Partial evidence still counts: Kagan argues that even a brief or incomplete brush with death, like a brief visit to another country, can still yield relevant evidence, rejecting the objection that near-death experiencers never really died.
• Descartes's imagination argument: if you can coherently imagine your mind existing while your body does not, then mind and body must be logically distinct things, not identical.

Walkthrough

Rejecting the free-will argument (0:00)

Kagan restates the three-premise free-will argument from last lecture and explains that all three premises must hold for the conclusion (that we're not purely physical) to follow. He then shows each premise can reasonably be challenged: some deny we have free will, quantum mechanics challenges universal determinism, and compatibilism challenges the claim that determinism rules out free will.

Quantum mechanics and probabilistic physics (8:06)

He explains, with the caveat that he is not a physicist, how the standard interpretation of quantum mechanics describes radioactive decay as genuinely probabilistic rather than governed by hidden deterministic causes, undermining the premise that all physical systems are deterministic.

Near-death experiences as evidence for a soul (17:14)

Turning to supernatural evidence, Kagan describes the common features of near-death experiences (leaving the body, a tunnel, a light, deceased loved ones) and presents the 'two-room' dualist explanation that a soul briefly visited an afterlife. He defends the value of this evidence against the objection that experiencers never really died, using an analogy of visiting France without moving there permanently.

Weighing the two-room and one-room explanations (26:23)

Kagan contrasts the dualist explanation with a physicalist account rooted in the body's stress response near death, including endorphin release and unusual brain stimulation. He also briefly discusses séances and communication with the dead, noting that professional debunkers like the Amazing Randi have never had to pay out their standing challenge. He concludes that physicalist explanations, while incomplete, remain the better bet.

Descartes's argument from imagination (37:42)

The lecture closes with a new kind of argument, tracing back to Descartes, that does not rely on explaining any feature but on a thought experiment. Kagan asks you to imagine waking up and discovering your body no longer exists while your mind continues to think and panic. Since you can imagine your mind existing without your body, Descartes concludes they must be logically distinct things, not identical, an argument the course will evaluate in the next lecture.

Before you watch

• This lecture directly continues the free-will argument introduced at the end of Lecture 4.
• The near-death experience discussion draws on a reading by Schick and Vaughn from the course pack.

Check your understanding

1. Why does the argument from free will require all three of its premises to be true, and which premise does Kagan personally find least secure?
2. How does the standard interpretation of quantum mechanics challenge premise three of the free-will argument?
3. Why does Kagan reject the objection that near-death experiences can't tell us anything about the afterlife because the people involved never permanently died?
4. What is the logical principle behind Descartes's claim that imagining your mind without your body shows they are distinct things?