Key idea: In adolescence, peers' approval becomes especially rewarding. Brain scans show why.
How peers shape the self
Belonging
Fitting in with a group shapes clothes, music, words and values.
Comparison
Teenagers judge themselves against friends: 'Am I as good, as liked, as brave?'
Reward
Approval from friends feels especially rewarding in adolescence.
Belong · Compare · Reward
Chein and colleagues (2011) scanned teenagers, young adults and adults playing a driving game, alone or knowing peers were watching. Only teenagers took more risks when watched, and their reward areas were more active.
Go further: higher-level insight: Reward areas mature before the prefrontal cortex (3.2.1): approval feels strong before self-control is fully ready.
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Key idea: Social media carries peer influence everywhere, all day.
Sherman and colleagues (2016) showed teenagers photos in a brain scanner. They were more likely to 'like' photos that already had many likes, and seeing their own photos liked activated reward areas.
What supports it
- Behaviour and brain measured together
- Age groups compared
- Same pattern on social media
Where to be careful
- Small samples
- Lab tasks, not real choices
- Brain activity is a link, not a cause
What HL adds: The technology extension: likes give instant, countable peer approval, so the same reward system that drives risk in a car can drive behaviour online.