The study was done by psychologist John Cacioppo at the University of Chicago.

芝加哥大学的心理学家约翰。卡希伯作了一项研究。

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Yet the impulse to call in to services like the Silver Line is a healthy one, Cacioppo said.

不过卡奇奥波说，想给这类服务热线打电话的冲动是健康的。

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That last statistic comes from a new book called Loneliness, co-written by John Cacioppo, a neuroscientist.

上面统计数字取自于由神经科学家John Cacioppo合著的名为 “孤独”一 本新书。

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John Cacioppo at the University of Chicago led the study.

VOA: special.2010.01.06

University of Chicago psychologist John Cacioppo led the recent study.

VOA: special.2009.12.22

However,Professor Cacioppo says existing research offers some possibilities.

VOA: special.2009.12.22

"The gene pool is really protected best by variability along that dimension, " Cacioppo said.

CNN: Feeling lonely? Genes might be at fault

Recent research suggests that non-lonely people tend to marry non-lonely people and lonely people tend to marry lonely people, Cacioppo said.

CNN: Feeling lonely? Genes might be at fault

Humans would not survive in the wild alone -- imagine trying to fend off a wild beast with a stick by yourself -- so they feel a negative signal when they are disconnected from others, Cacioppo said.

CNN: Feeling lonely? Genes might be at fault