In Which of the Following Studies Can We Tell That

Multiple Choice

In which of the following studies can we tell that the infant is discriminating between stimuli?

A) The infant relaxes when hearing a specific song because that song was previously paired with relaxation.
B) The infant sucks longer and harder to hear their mother read a story that they were exposed to prenatally than another story.
C) An infant doesn't avoid the odour of garlic after prenatal exposure to garlic through the mother's digestion.
D) The infant copies the facial expression of an adult who is in their visual field.