Epidemic of Loneliness

Loneliness, which Emily Dickinson described as “the Horror not to be surveyed,” is a quiet devastation. But in Britain, it is increasingly being viewed as something more: a serious public health issue deserving of public funds and national attention.

Researchers have found mounting evidence linking loneliness to physical illness and to functional and cognitive decline. As a predictor of early death, loneliness eclipses obesity.

Kay M. Tye and her colleagues found that when mice were housed together, dopamine neurons in the D.R.N. were relatively inactive. But after the mice were isolated for a short period, the activity in those neurons surged when those mice were reunited with other mice.

“This is the first time we’ve found a cellular substrate for this experience,” said Dr. Tye, an assistant professor at the Picower Institute for Learning and Memory at M.I.T. and a senior author of the paper. “And we saw the change after 24 hours of isolation.”

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