0:00 In the 1980s, a neuroscientist named Benjamin Libet ran an experiment that found your brain shows signs of making a decision up to several hundred milliseconds before you are consciously aware of having made it.0:15 Mm-hm.0:16 The electrical activity for, say, flicking your wrist, it just...0:21 starts, before the little voice in your head says "okay, now." Wow.0:26 This feels like a completely different kind of puzzle from the big cosmic questions we talked about last week.0:34 The origin of the universe is out there.0:37 This is...0:38 in here.0:38 This is about whether "I" am even the one talking right now.0:43 Exactly.0:43 And that’s why after decades of research, the question of free will is more alive than ever.0:50 Because the science didn't solve it.0:53 It just made the problem deeper and, you know, much more personal.0:58 Okay, so walk me through that.1:00 Libet sees a brain signal before a conscious choice.1:04 Case closed, right?1:05 No free will.1:06 We're just puppets and our brain is pulling the strings.1:10 That was the initial, very loud conclusion some people drew.1:15 But it’s not that simple.1:17 I mean, think about it.1:19 Is a flicker of preparatory brain activity the same as a complex, reasoned decision?1:25 Like, deciding to get married, or change careers?1:28 That’s not a millisecond-level event.1:31 Right.1:32 That’s a process.1:33 So the experiment might just be showing the very last step in the chain—the brain getting the motor command ready—not the whole deliberation.1:43 Precisely.1:44 And this is where the philosophers step in and, you know, save the day, sort of.1:50 They draw a line between what they call libertarian free will—this idea that we are totally uncaused authors of our actions—and another view called compatibilism.2:02 Compatibilism.2:03 Meaning free will is...2:05 compatible with determinism?2:07 How does that even work?2:09 The idea is that, yes, your decisions are products of your brain, your history, your genetics.2:16 They are determined in that sense.2:19 But, uh, freedom means acting according to your own values and desires without external coercion.2:26 If your brain, which is you, makes a decision based on your character...2:31 that's still a free choice.2:33 Huh.2:33 So as long as it's my brain doing the deciding and not someone else's, I'm free.2:39 That's the argument.2:41 It redefines freedom.2:43 It’s not freedom from causality, but freedom from coercion.2:47 So where does that leave the neuroscientists?2:50 Are they still looking for the "free will" spot in the brain?2:55 Not really.2:56 They're doing something more subtle now.2:59 There was a study just this year, in Nature Neuroscience, where they could decode what someone was typing just from their brain activity, with pretty high accuracy.3:11 Whoa.3:11 Yeah.3:12 But again, does that predictive power negate free will?3:16 Or does it just show that our intentions have a physical basis in the brain?3:21 Which...3:22 of course they do.3:23 Where else would they be?3:25 Okay, so this is where I get stuck.3:28 It feels like a circular argument.3:30 It can.3:31 Which is why I love the argument from Michael Egnor, a neurosurgeon at SUNY Stony Brook.3:38 He makes a really sharp point.3:40 What's that?3:41 He says that denying free will is self-refuting.3:44 Wait.3:45 Say that again.3:46 To argue against free will, you have to consciously weigh evidence, formulate a position, and then decide to share it, believing your argument has merit.3:57 You are acting, in every single way, as if you have the freedom to choose the more rational argument.4:05 You're using your free will to argue that you don't have it.4:09 Oh, that's...4:10 that's really good.4:12 So the skeptic is caught in their own trap.4:15 They act like they have it, even when they're arguing it doesn't exist.4:20 Egnor says everyone, even the staunchest deniers, lives their life as if they are free.4:27 They praise their kids for good choices and get angry at other drivers for bad ones.4:33 Nobody acts like we're just, you know, bacteria in a petri dish.4:38 So the lived experience is just too powerful to deny.4:42 Even if the science is ambiguous.4:44 I think that’s it.4:45 And that’s what makes this whole question so...4:49 profound.4:50 The science gives us hints about the machinery—the unconscious biases, the predictive brain signals.4:57 And that's valuable!4:59 It can foster empathy, you know, helping us understand that people are influenced by things outside their control.5:07 But it doesn't eliminate the role of the conscious self.5:11 The "I" that chooses.5:13 Exactly.5:14 It doesn't give us a final answer.5:16 And maybe that's the point.5:18 The mystery of free will forces us to confront what it means to be responsible, what it means to be a person.5:26 And honestly, I think wrestling with that question is far more important than ever finding a definitive answer.
