Imagine you’re a professor beginning to lecture to a class composed of students who share the same primary language and are citizens of the same country. You would assume that your words are understood the same way by most students, even if they disagree with the opinions associated with those words.

Not so, says Dr. Celeste Kidd, a psychologist at the University of California, Berkeley, writing in the Wall Street Journal Review. Her research found that not only do our brains view polarized subjects such as politicians differently, but “people do not see eye to eye about even the basic characteristic of objects. We overestimate how many people see things as we do…words simply don’t mean the same thing to different people,” even those who are seemingly very similar.

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