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For early humans,
being alone was no way to live. Those on the tribe’s periphery faced
increased risks of starvation, predation and early death. And so humans
(like other communal creatures) evolved what seem to be specific
biological reactions to social threats. A social animal that feels
itself to be isolated from its kind begins to behave nervously and experiences unhealthy physiological responses.
The body produces more stress-related biochemicals, leading to
inflammation and a reduced ability to fight viral infections. These
adaptations might help explain why many chronically lonely people have
an overabundance of stress-related cells and weakened immune systems.
But how they see the world — how loneliness affects their thinking — may
be just as consequential to their health.
This conclusion finds support in a study recently conducted
by researchers at the Center for Cognitive and Social Neuroscience at
the University of Chicago. They began with a group of healthy young
volunteers who completed a loneliness questionnaire: 32 were categorized
as socially well integrated and 38 as lonely, perceiving themselves as
lacking intimate connections with another person. The subjects were all
equipped with sensors that register electrical activity in the brain
and then watched words in various colors flash across a computer screen.
Some of the words reflected general positive and negative emotions,
like ‘‘pleasure’’ and ‘‘misery.’’ Others referred overtly to positive
and negative social interactions — ‘‘accepted’’ and ‘‘unwanted,’’ for
example.
Among the lonely, the
areas of their brains related to attention lit up much more quickly than
those of the other subjects when they saw words related to social
isolation like ‘‘excluded,’’ ‘‘foe’’ and ‘‘detached’’ than when they saw
generally negative words like ‘‘frustrated’’ and ‘‘vomit.’’ Their
brains were also far less engaged by words with a positive connotation
compared with those of the socially connected volunteers. The findings
were unchanged when the researchers adjusted for depression and other
factors. (Lonely people aren’t necessarily depressed, and vice versa.)
The results show that
the lonelier you are, the more your attention is drawn toward negative
social information, says one of the researchers, John Cacioppo, whose
colleague and wife, Stephanie, led the study, which appeared in the
journal Cortex. Lonely people seemed inadvertently hypervigilant to
social threats. Rather poignantly, such thinking itself most likely
makes the loneliness worse, he says, by nudging the lonely to
‘‘unknowingly act in a more defensive, hostile way toward the others
with whom they would like to connect.’’
There are lessons in
this data for both the isolated and the communal, and they seem less
facile now that they are backed by research. Be nice and gently
welcoming to the curmudgeons you meet. Invite them to share coffee.
Don’t push for reciprocal invitations, perhaps. And if you happen to be
the curmudgeon, accept that invitation. It isn’t coming from a predator
out to devour you.
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