David Eagleman

Lie detection is a very fascinating thing because you can actually measure things in neuroimaging when somebody is doing a lie because essentially a lie requires two things. One is... squelching the truth. Let's ask you a question. You know what the truth is. I say, hey, what's your wife's name?

You know what the true answer is, but then you have to squelch that and then you have to cook up a new version. Okay. And so what happens when you lie is there's a couple of different regions that we can see in the brain. Okay. So when that was discovered about the year 2000, a couple of companies started right away to do fMRI lie detection. Okay. But they both went out of business.

You know what the true answer is, but then you have to squelch that and then you have to cook up a new version. Okay. And so what happens when you lie is there's a couple of different regions that we can see in the brain. Okay. So when that was discovered about the year 2000, a couple of companies started right away to do fMRI lie detection. Okay. But they both went out of business.

You know what the true answer is, but then you have to squelch that and then you have to cook up a new version. Okay. And so what happens when you lie is there's a couple of different regions that we can see in the brain. Okay. So when that was discovered about the year 2000, a couple of companies started right away to do fMRI lie detection. Okay. But they both went out of business.

And here's why. It's because it's super easy to fool these things. Because, for example, if I'm in the scanner, I can move my foot around or do other things or think about some other thing and screw up the whole signal. These are very sensitive signals. And it turns out lie detection.

And here's why. It's because it's super easy to fool these things. Because, for example, if I'm in the scanner, I can move my foot around or do other things or think about some other thing and screw up the whole signal. These are very sensitive signals. And it turns out lie detection.

And here's why. It's because it's super easy to fool these things. Because, for example, if I'm in the scanner, I can move my foot around or do other things or think about some other thing and screw up the whole signal. These are very sensitive signals. And it turns out lie detection.

There's also there's a misunderstanding about lie detection, which is there's no such thing as a lie that you're just reading. Let's say with the traditional lie detector, the polygraph test that they use in courts. You're not measuring a lie. What you're measuring is the stress, the physiological stress that's typically associated with the lie.

There's also there's a misunderstanding about lie detection, which is there's no such thing as a lie that you're just reading. Let's say with the traditional lie detector, the polygraph test that they use in courts. You're not measuring a lie. What you're measuring is the stress, the physiological stress that's typically associated with the lie.

There's also there's a misunderstanding about lie detection, which is there's no such thing as a lie that you're just reading. Let's say with the traditional lie detector, the polygraph test that they use in courts. You're not measuring a lie. What you're measuring is the stress, the physiological stress that's typically associated with the lie.

So if you ask me a question and I'm lying to you, there's certain stress that goes with that. And that's what's being picked up on. But let's say I'm a particularly good liar or I practice this lie a bunch or I'm a psychopath and I don't care that I'm lying. It doesn't stress me out at all. Then there's not going to be that signal.

So if you ask me a question and I'm lying to you, there's certain stress that goes with that. And that's what's being picked up on. But let's say I'm a particularly good liar or I practice this lie a bunch or I'm a psychopath and I don't care that I'm lying. It doesn't stress me out at all. Then there's not going to be that signal.

So if you ask me a question and I'm lying to you, there's certain stress that goes with that. And that's what's being picked up on. But let's say I'm a particularly good liar or I practice this lie a bunch or I'm a psychopath and I don't care that I'm lying. It doesn't stress me out at all. Then there's not going to be that signal.

I believe you, but a good liar would say the same story that you're saying, by the way.

I believe you, but a good liar would say the same story that you're saying, by the way.

I believe you, but a good liar would say the same story that you're saying, by the way.

Oh, man. If you're a sophisticated liar, you would set this up so that then people around you think, oh, we know when Jordan's lying, so then you can get away with it.

Oh, man. If you're a sophisticated liar, you would set this up so that then people around you think, oh, we know when Jordan's lying, so then you can get away with it.

Oh, man. If you're a sophisticated liar, you would set this up so that then people around you think, oh, we know when Jordan's lying, so then you can get away with it.

Yeah. Yeah, that's exactly right. That's one of the issues is the sanctity of your inner cosmos. Yeah. So just as an example, there was a case in the 1960s where the police thought this guy probably had drugs. They broke into his house and he ran upstairs and they chased him. After he got to his bedroom and there were these pills on the dresser and he