Brain Health, Decoded

Brain Health, Decoded

How to Stop Wasting Your Life

A neuroscientist's guide to dopamine and reclaiming your attention

Dr. Dominic Ng's avatar
Dr. Dominic Ng
Nov 25, 2025
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Picture this: It’s 8 PM. You pick up your phone just to check the weather for tomorrow.

Twenty minutes later, you’re watching a video of a stranger power-washing a driveway. You haven’t checked the weather. You feel groggy, annoyed, and strangely guilty.

You tell yourself:

  • “I have no self-control.”

  • “I’m just lazy.”

  • “Why can’t I focus?”

Stop right there. You aren’t broken. You are fighting against a supercomputer designed to hack your biology.

Here is the mechanism of your addiction, and the specific protocol to break it.

Why You Can’t Just Put It Down

We tend to assume that we stay on our phones because we are being entertained. We think, “I’m having fun, so I’m still scrolling.” That is a lie your brain tells you.

You aren’t scrolling for pleasure; you are scrolling for the promise of pleasure.

To understand this, you have to look at dopamine. Pop culture calls it the “happiness molecule,” but that is a myth. Dopamine isn’t the feeling of satisfaction you get after a good meal. It’s the hunger that drives you to hunt for the food in the first place.

How Dopamine Guided Our Ancestors

Our brains evolved in a world where survival depended on finding things that were hidden.

Imagine a hunter-gatherer approaching a berry bush. To understand why you are addicted to your phone, you have to understand how his brain reacts to three different scenarios:

  • The Guaranteed Reward: He knows the bush is full of fruit. He eats it. Result: Zero dopamine spike. Because the reward was predicted, his brain remains chemically flat.

  • The Guaranteed Failure: He knows the bush is empty. He walks past it. Result: Zero dopamine spike.

  • The Uncertain Reward: He doesn’t know if there is fruit. He pushes the leaves aside and suddenly finds a handful of berries. Result: A massive dopamine spike.

This specific spike is called a Reward Prediction Error. It is not a feeling of contentment; it is a learning signal. The chemical explosion screams at the brain: “We didn’t expect that! That was valuable! Remember this action and do it again.”

The biological goal of this mechanism is simple: it turns you into a relentless investigator. The ancestors who had this massive chemical reinforcement for checking uncertain sources didn’t just check one bush; they checked every bush.

They found more food, survived longer, and passed this obsessive “checking gene” down to you.

From Berry Bushes to Infinite Scrolls

Our friendly tech billionaire compatriots have now hijacked this survival instinct. They know that because occasionally a notification is exciting, or a TikTok video is amazing, your brain learns a powerful lesson: “I need to check all of them.”

Here is what this looks like in your daily life:

  • TikTok and Reels: You swipe because the next video might be the funniest thing you see all day.

  • Email and News Apps: You refresh because there might be good news hidden in the pile of work.

  • Dating Apps: You keep swiping because the next profile might be “The One.”

  • Substack Notes and Twitter: You scroll past the boring posts because the next one might be an insight that changes your perspective.

How to Take Back Control

Phase 1: Preparation

In order to tackle this you first need to know why you are doing this. Then, you need to identify exactly what is holding you back.

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© 2025 Dr. Dominic Ng
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