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The Social Brain
The potential for miscommunication among the networks of our brains might not be so bad if we lived in isolation, but our brains are social organs, which require sustained connection with other brains. At birth, we're totally dependent on our caretakers for our survival. If an average reptile is born knowing how to perform the basic tasks of survival—getting food, fighting, and mating—we're born dumb, so to speak. Our saving grace is that as babies we know how to attach to our parents and stimulate them to attach to us.
For human babies, survival doesn't depend on how fast they can run, climb a tree, or tell the difference between edible and poisonous mushrooms: it depends on their abilities to detect the needs and intentions of those around them. Throughout the millennia that we Homo sapiens have inhabited the earth, if we've been successful in our early relationships, we have food, shelter, protection, and a decent shot at eventually producing children of our own.
Our prolonged dependency allows for an increasing amount of brain development to occur after birth, making each human brain an experiment of nature—a unique blending of genetics and experience. Our parents are the primary environment to which our baby brains adapt, and their unconscious minds are our first reality. Their nonverbal communications and patterns of responding to our needs when we're babies shape not only our perceptions of ourselves and the world, but also the architecture of our brains. Because the first few years of life are a period of exuberant brain development, early experiences have a disproportionate impact on the shaping of our neural systems, with lifelong consequences.