Many people are looking at the benefits of digital media in education, and not many are looking at the costs," said Patricia Greenfield, a distinguished professor of psychology in theUCLA College and senior author of the study. "Decreased sensitivity toemotional cues —losing the ability to understand the emotions of other people —is one of the costs. The displacementof in-person social interaction by screen interaction seems to be reducing social skills."A. SubstitutionB. AdvanceC. SupportD. Establishment