Question 1
All children begin to smile and coo at approximately the same age. Identify at least two key concepts that might explain these behaviors.
Question 2
An experiment is testing the effectiveness of cognitive therapy in treating anxiety. There are two groups: one group receives cognitive therapy; the other group meets weekly with a therapist who does not use cognitive therapy, but merely chats during the session. Using the terminology of research, identify each of the two types of groups.