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Social media-from Facebook to Twitter-have made us more densely networked than ever. Yet for all this connectivity, new research suggests that we have never been lonelier (or more narcissistic)-and that this loneliness is making us mentally and physically ill. Social interaction matters. Loneliness and being alone are not the same thing, but both are on the rise. We meet fewer people. We gather less. And when we gather, our bonds are less meaningful and less easy. The decrease in confidants-that is, in quality social connections-has been dramatic over the past 25 years. In one survey, the mean size of networks of personal confidants decreased from 2.94 people in 1985 to 2.08 in 2004. Similarly, in 1985, only 10 percent of Americans said they had no one with whom to discuss important matters, and 15 percent said they had only one such good friend. By 2004, 25 percent had nobody to talk to, and 20 percent had only one confidant.

This article is relevant to the Genie case, outlining the many ways isolation is physically bad for us. Chronically lonely people have higher blood pressure, are more vulnerable to infection, and are also more likely to develop Alzheimer's disease and dementia. Loneliness also interferes with a whole range of everyday functioning, such as sleep patterns, attention and logical and verbal reasoning. The mechanisms behind these effects are still unclear, though what is known is that social isolation unleashes an extreme immune response - a cascade of stress hormones and inflammation. This response might've been biologically advantageous for our early ancestors, when being isolated from the group carried big physical risks, but for modern humans, the outcome is mostly harmful. A 1957 McGill University study, recreated in 2008 by Professor Ian Robbins, head of trauma psychology at St George's Hospital, Tooting, found that after only a matter of hours, people deprived of perceptual stimulation and meaningful human contact, started to crave stimulation, talking, singing or reciting poetry to themselves to break the monotony. Later, many of them became anxious or highly emotional. Their mental performance suffered too, struggling with arithmetic and word association tests. In addition, subjects started hallucinating. The brain is used to processing large quantities of data, but in the absence of sensory input, Robbins states that "the various nerve systems feeding in to the brain's central processor are still firing off, but in a way that doesn't make sense. So after a while the brain starts to make sense of them, to make them into a pattern." It tries to construct a reality from the scant signals available to it, yet it ends up building a fantasy world.

Recent studies suggest that metaphors are more than just fancy literary devices and that there is a psychological basis for linking cold with feelings of social isolation. Psychologists Chen-Bo Zhong and Geoffrey Leonardelli from the University of Toronto's Rotman School of Management wanted to test the idea that social isolation might generate a physical feeling of coldness. In their first experiment, they divided a group of volunteers into two groups. One group recalled a personal experience in which they had been socially excluded-rejection from a club, for example. This was meant to tap into their feelings of isolation and loneliness. The other group recalled an experience in which they had been accepted into a group. Afterwards, volunteers were asked to estimate the temperature in the room. Those who recalled memories of being ostracized experienced the ambient temperature of the room as colder. In a second experiment, researchers triggered feelings of exclusion by having volunteers play a computer-simulated ball tossing game. The game was designed so that some of the volunteers had the ball tossed to them many times, but others were left out. Afterwards, all the volunteers rated the desirability of certain foods and beverages: hot coffee, crackers, an ice-cold Coke, an apple, and hot soup. The findings were striking. As reported in the September issue of Psychological Science, a journal of the Association for Psychological Science, the "unpopular" volunteers who had been ostracized during the computer game were much more likely than the others to want either hot soup or hot coffee. Their preference for warm food and drinks presumably resulted from physically feeling cold as a result of being excluded. "It's striking that people preferred hot coffee and soup more when socially excluded," Leonardelli said. "Our research suggests that warm chicken soup may be a literal coping mechanism for social isolation."