Twenge and her colleagues wanted to understand why this change in average wellbeing occurred.

特温格和她的同事们想要了解为什么平均幸福感会发生这样的变化。

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In fact, when Twenge previously used this data to suggest a screen time effect, some commentators were quick to raise this problem.

事实上，当特文格之前使用这些数据来说明屏幕时间效应时，一些评论者很快就提出了这个问题。

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Twenge and her colleagues also found that across the key years of 2013-16, well-being was indeed lowest in years where adolescents spent more time online.

特温吉和她的同事还发现，在2013年至2016年的关键时期，青少年上网时间最长的那几年幸福感确实最低。

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In their book, Twenge and Campbell list the factors fueling the entitlement mentality.

CNN: Commentary: Joe, Kanye, Serena -- aren't they special?

"Narcissism is absolutely toxic to society, " Twenge told me when I interviewed her about her book a few months ago.

CNN: Commentary: Joe, Kanye, Serena -- aren't they special?

One person who has zeroed in on this is Jean Twenge, an associate professor of psychology at San Diego State University.

CNN: Commentary: Joe, Kanye, Serena -- aren't they special?