Early experience shapes us: critical periods, attachment and inherited memories
Erich Jarvis explains critical periods for language and accents, Huberman shows how childhood attachment styles carry into adult love, and Rechavi explores whether experiences can even pass to the next generation. Together they show how strongly early and ancestral experience shape who we become, and where science still has open questions.
What is a critical period? Show answer
A window in development when the brain learns something best. Erich Jarvis says the whole brain has them and speech has an especially strong one.
Why is it easier to learn a language without an accent as a child? Show answer
Children still have a broad set of innate sounds. Adults have pruned to the sounds their languages use, so new sounds must be learned from first principles.
Why do people raised with several languages find new ones easier, according to Jarvis? Show answer
They have kept a wider set of sounds to recombine, not because their brains are more plastic.
Why does Jarvis think the brain closes learning windows? Show answer
The brain can only hold so much information, so locking in early learning stops it being overwritten, which helps survival.
What is the strange situation task? Show answer
Mary Ainsworth's test in which a caregiver leaves a toddler with a stranger and returns, while researchers watch the child's reaction to sort attachment styles.
Why do childhood attachment styles predict adult romantic ones, per Huberman? Show answer
The same neural circuits that linked child and caregiver are repurposed later for adult bonds.
What did the World War II bombing studies show? Show answer
Children of very stressed mothers stayed physiologically stressed for decades, while mothers who made shelter trips like a game had children with little distress.
Can attachment styles change? Show answer
Yes. Huberman says they are plastic, that knowing your template helps, and that secure people can become less secure with a less adaptive partner.
What has Oded Rechavi shown about inheritance in worms? Show answer
That experiences such as virus infection, starvation and heat change descendants through small RNA molecules, usually for three to five generations.
Why is an effect on a starved mother's child not necessarily inheritance? Show answer
The baby was directly exposed to the environment in the womb, so the difference needs no new biology to explain it.
Can memories be inherited, according to Rechavi? Show answer
Complex, arbitrary memories almost certainly cannot, because information stored in brain connections would have to pass through a single fertilized cell.
Where is the science least settled among the three topics? Show answer
Inherited experience in humans. It is firmly shown in worms but unclear in people, even though popular belief in inherited trauma is strong.