Understanding Addiction: The Ancient Brain in a Modern World

• newEditor

Addiction: Our Ancient Brain vs Today

Text

What do you already know about why addiction is so common?

Learning Objective

At the end of the lesson you will be able to explain how ancient brain systems make us vulnerable to addiction and describe how modern environments trigger addictive behaviours.

What Is Addiction?

Addiction is a brain-based condition where a person is driven to repeatedly seek out certain substances or behaviours, despite harmful consequences.

Why Are We So Vulnerable?

Our brains evolved to seek rewards and avoid pain for survival. These reward systems are millions of years old and are shared even with primitive animals.

Modern World: Too Much Stimulation

Today, we are surrounded by substances and activities—like junk food, nicotine and digital media—designed to overstimulate our reward pathways.

The Role of Dopamine

Dopamine is a brain chemical that signals pleasure and teaches us to repeat behaviours. Addictive substances give a powerful rush of dopamine.

How Addiction Changes the Brain

Withdrawal

Tolerance

Stopping the addictive behaviour can make a person feel low, anxious or irritable. This is withdrawal.

Over time, the brain reduces sensitivity to dopamine. More of the substance or behaviour is needed for the same effect.

Key Takeaways

Our ancient brains are not designed for the temptations of modern life. Understanding this helps us support those struggling and look for better ways to prevent and treat addiction.

Write down 3 things you learned in this lesson.

Write down 2 things you want to know more about.

Ask 1 question about something you haven't quite understood yet.