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“This is why play and communication, and giggling and the recognition of mother’s face, are so important in the first year of life. The physical and mental use of neural circuits makes cells ‘light up’ with metabolic activity so neurons can find one another and make new connections, sometimes at long distances in the brain.” Yet, this connection making can go wrong. “When cells suspect danger, they resist sending out the longer connections. Their axons are shorter and they have fewer branches. However, even though they send out fewer long axons, neurons still engage in local activity as the drive to make connections during early development is very strong,” said Dr. Naviaux. The result is a brain filled with isolated islands of superconnectivity that can perform specific tasks at remarkable speeds.” — Matt Kaplan