How do early experiences help a baby's brain develop?

Early experiences - say, being exposed to both English and Russian as an infant, or constantly interacting with a caregiver - lay down neural circuits that are actually customized for every individual. So while a newborn baby might have the neurological capacity for learning violin, or being a history whiz, or even developing nurturing relationships, the neurological circuitry is not yet hooked up. The neurons are waiting for the signals, the stimuli that give them the green light to connect, to fire, to lay the neurological foundation that will enable particular information to be processed in the brain.

The more often the experience is repeated, the stronger these circuits grow. The less typical the experience, the weaker they become, until they are eventually pruned away. The reason why the "old dog, new tricks" mantra is largely true is because the brains of children are more plastic than those of adults.

Neural pathways are like freeways through the middle of cities: once established, it's much more difficult to change their direction or increase their lanes.

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