How do opinions catch fire?

Podcast Episode 7

In this episode of Tiny Shifts, Andrew Nunn explores the powerful idea of social contagion: how our thoughts, emotions and behaviours are shaped by the people and environments around us.

Drawing on fascinating historical examples, psychology research and real-world studies, Andrew breaks down how moods spread, how expectations shape our biology, and why we’re far less independent than we think.

If we’re not as independent as we believe… what is actually influencing us every day?

This episode reveals how invisible social forces, from conversations to headlines: quietly shape our decisions, habits and mental states, and how we can use that awareness to take back control.

What you’ll learn in this episode

Why we’re more socially influenced than we realise
How emotions and behaviours spread through groups
The difference between homophily (similar people grouping) and contagion (influence spreading)
How your environment silently shapes your habits and mindset
Why expectations can create real physical responses (the nocebo effect)
How habits spread through clusters, not just individuals
The surprising “boomerang effect” in behaviour change
Simple ways to design your environment for positive change

Key topics covered

Social contagion
Behavioural influence
Group dynamics
Expectation effect (placebo vs nocebo)
Mirror neurons and emotional spread
Habit formation and clusters
Social approval and behaviour
Environment design
Mindset and behaviour change

Timestamps

00:00 – Strange cases of mass behaviour (meowing nuns, dancing plague)
01:30 – Introduction to social contagion
02:30 – Why we think we’re independent (but aren’t)
03:50 – The ripple effect and three degrees of influence
05:30 – Mirror neurons and emotional spread
06:20 – The expectation effect and nocebo
08:40 – Why some habits spread and others don’t
09:50 – The boomerang effect explained
11:00 – The “input audit” framework
11:30 – Step 1: Spot the contagion
12:00 – Step 2: Create your cluster
12:50 – Step 3: Add your own “smiley face” (reward behaviou

Transcript Editor Embed

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00:01:590|Andrew|In the middle ages, there was a convent in France where one nun started to meow like a cat. Yes, I'm not joking, but that wasn't the strangest part. The strangest part was that other nuns started to actually join in. Eventually the whole convent would meow together for hours and days on end and villages nearby were pretty terrified to be honest. No one could really explain what was happening.
01:31:618|Andrew|My name is Andy Nunn and welcome to the Tiny Shifts podcast. We are on episode number seven. This show is about how the mind really works. Now, this isn't how we wish it worked, sadly, but how it works. And today we're gonna talk about social contagion. It's one of the most interesting, I think, topics.
03:54:878|Andrew|So let's start with the ripple effect. And this is where it gets sort of wild, right? This is some pretty crazy stuff. You are not just influenced by your close friends. You're influenced by your friends' and even their friends.
06:19:535|Andrew|Your brain isn't just reacting to the world. Like I say, it's predicting it. So that Portuguese TV show in 2000 ran an episode about a deadly virus hit in a school. And soon after the students in the school developed the same symptoms.
08:48:621|Andrew|It's like if one person at work was sort of meditating, not going to do anything, but everyone at work meditated, you're very likely to do it. Your odds go up massively because it begins to feel normal.
11:07:906|Andrew|Well, here's the shift. I call it the input audit. So for one week, pay attention to three things. First, spot the contagion. So when you feel angry, when you feel some emotion, maybe anxious, you want to buy something, you pause and ask this, where did that feeling come from?
12:00:000|Andrew|Step number two, create your cluster. So if you want to change something that's hard, don't just rely on one role model. So stack your environment.
12:50:000|Andrew|Last but not least, it's a bit cheesy, but add your own smiley face. So when you do something right, acknowledge it. You know, say well done, reward yourself because it does matter.
13:31:587|Andrew|So we laughed at the beginning, what I did at dancing plagues and meowing nuns, but I think it's really important to remember we are running the same mental software.
13:47:888|Andrew|Today isn't about willpower and going out and trying really hard. It's placement. Put yourself near the people who live the life you want to catch.

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