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Inner Cosmos with David Eagleman

Ep140 "How does your brain decide what’s true?" with Sam Harris

Inner Cosmos with David Eagleman

iHeartPodcasts

Health & Fitness, Education, Science, Self-improvement, Mental Health

4.7620 Ratings

🗓️ 9 February 2026

⏱️ 81 minutes

🧾️ Download transcript

Summary

Why do we believe what we believe? Why is changing our opinions so difficult, and why does a challenged belief so often feel like a personal attack? What if beliefs didn’t evolve to be true, but to be socially useful? Today we speak with Sam Harris about the topic of our beliefs: how we see the world and what we take to be true about it.

Transcript

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0:00.0

Why does changing your mind sometimes feel like losing a part of yourself?

0:10.8

If beliefs are supposed to track truth, why do they so often track our tribe instead?

0:18.3

Why does a challenged belief feel like a personal attack? What does your brain think

0:24.1

it's defending when it defends an idea? What if beliefs didn't evolve to be true, but to be useful?

0:33.2

What if your strongest convictions are solving social problems, not intellectual ones?

0:39.2

Today, we'll speak with public intellectual and neuroscientist Sam Harris about the topic of our beliefs.

0:50.0

Welcome to Inner Cosmos with me, David Eagleman.

0:52.8

I'm a neuroscientist and author at Stanford,

0:55.5

and in these episodes, we sail deeply into our three-pound universe

0:59.2

to understand how we see the world.

1:01.8

And importantly, today, what we take to be true about it.

1:15.6

This isn't I-Heart podcast.

1:17.7

Guaranteed human.

1:29.3

Your brain has a lot of beliefs about what is true or false.

1:36.4

So if I ask you, is Paris the capital of France, your brain immediately judges the truth value of that statement.

1:38.0

Is it accurate or inaccurate?

1:40.4

How about if I ask you, is 10 plus 10, 21?

1:51.0

Your brain has to take in the auditory information and compare it against what it knows and make a decision. And most people would probably agree with your judgments on these questions. But this can, of course, get more complex when it involves other kinds of beliefs, like Muhammad was a holy

2:04.0

prophet chosen by Allah to deliver a message to humanity. Some people think that's a true

2:09.9

statement. Others think that's false. Or the statement, early abortion should be supported. Or Trump is on balance a good president, or whatever.

2:21.9

I'm not suggesting how you should evaluate these sentences.

2:24.5

I'm just pointing out there are lots of sentences I can say that you might find true or false.

...

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