TED Health The science of raising kids (Part 3): Why adolescent brains are wired differently | Jennifer Pfeifer
Feb 24, 2026
Jennifer Pfeifer, a neuroscientist who studies adolescent brain development, hormones and social relationships, unpacks why teen brains are uniquely tuned for learning and social connection. She reframes adolescence as growth. She discusses puberty effects on sleep and mood, decision-making timelines, limited impact of social media, and how relationships and support build resilience.
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Adolescence Lasts From Puberty To Social Adulthood
- Adolescence spans roughly ages 10 to 25, defined by puberty's biological start and social transition to adult roles.
- Puberty shifts include hormones and a sleep phase delay, and earlier physical maturation raises depression risk mainly via social perception changes.
Puberty Delays Teen Sleep And Alters Social Risk
- Puberty shifts teenagers' circadian rhythm so they naturally fall asleep 1–2 hours later, creating 'night owls.'
- Early-maturing girls face higher depression risk because of body-image and social treatment, not hormones alone.
Talk Openly About Puberty With Middle Schoolers
- Talk candidly about puberty to set a foundation for honest future conversations.
- Open communication helps young people navigate bodily changes and reduces bias-driven harms like adultification.