Introverts are just as passionate about what they do as extroverts, study finds. Researchers from Harvard Business School and the Humboldt University in Berlin found the key trigger for unequal treatment: the way someone expresses enthusiasm.

The researchers recommend first asking team members without judgment: How do you behave when you are enthusiastic about work? They could also allow introverts to use other forms of communication, such as written reports or one-on-one conversations. And they should make sure that when it comes to promotions, bonuses or raises, they are considering a person's actual performance.