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It wasn’t long ago that the worry was that rich students would have access to the internet earlier, gaining tech skills and creating a digital divide. Schools ask students to do homework online, while only about two-thirds of people in the U.S. have broadband internet service. But now, as Silicon Valley’s parents increasingly panic over the impact screens have on their children and move toward screen-free lifestyles, worries over a new digital divide are rising. It could happen that the children of poorer and middle-class parents will be raised by screens, while the children of Silicon Valley’s elite will be going back to wooden toys and the luxury of human interaction.

I think we already have enough of the quantifiable (although it is poorly distributed, a separate though deeply related issue). What we need more of are the things that are hard to quantify. The rising tide of suicide and depression in the developed world is not caused by shrinking residential floor space or lack of access to 4G cell service. It probably has something to do with the disintegration of community, the withering of connection, loss of purpose and meaning, chronic pain and unresolved trauma, unprocessed grief, ambient anxiety, and the other accoutrements of Separation. This point seems obvious here at my brother’s farm where I write this, because my life is rich here; rich in relationship to the natural world through my hands, my senses, my labor, and yes, my bare feet, and rich in relationship to the human world as well through shared labor, common purpose, and mutual reliance. And the point seems equally unobvious when I’m separated from all these things. In the busy world of cars and clocks and screens, faster and more of them seems like progress.

A common misconception is that these youths are choosing to engage in the commercial sex trade. But as recent advances in neuroimaging techniques help scientists unravel the myriad ways that trauma affects the brain, emerging evidence suggests that brain changes resulting from trauma could make young people more vulnerable to exploiters and less receptive to people trying to help. Rather than making a conscious decision to rebel, these kids are simply doing their best to survive, using the adaptive strategies that their brains developed in response to a perilous world.

Though the human brain is adaptable throughout life, adaptability is greatest during childhood, as the developing brain responds to the surrounding environment. Survival is the brain's top priority. Young people growing up in dangerous environments will develop brains that are highly responsive to threat cues. In particular, recent studies show that children who have experienced trauma exhibit drastic changes in their amygdala, an area of the brain wired to identify signs of danger.

Besides the amygdala, another brain region affected by trauma is the hippocampus, an area involved with contextual learning and memory. The hippocampus takes context into account, so that a person can appropriately respond to the same cues in different situations. For instance, most people would respond differently to hearing gunfire in a shooting range than they would to hearing gunfire in an airport.