The Family Educational Rights and Privacy Act is a Federal act that guards the confidentiality of student education accounts. The law is applicable to all institutes that accept resources under an appropriate program of the U.S. Department of Education. Kristi can say that, "I'm sorry, but these are my personal notes, so I am not obligatory to share them with you."
The method in question is called the still-face paradigm.
Infants like to see the reaction in other people when they are doing something - smiling, laughing, vocalizing, pointing at something. However, when this paradigm was used, people would just stare at the child emotionlessly. Suddenly, the child would grow anxious and desperately seek the person's attention, which tells us a lot about their expectations.