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 behaviour)
Related insights
You may also want to explore:
Home – www.andrewnunn.com
Mind the Gap keynote – Andy Nunn keynote speaking
Speaking and contact enquiries – contact Andy about your event
LinkedIn – Link
Social and Podcast links
Instagram: andythementalist
Tiny Shifts Podcast: How Opinions Catch Fire: Inside the psychology of social contagion
