The only research design that allows one to make cause-and-effect inferences is the _____ design

In the section on Bricks and Balloons, what does internal balance mean?

a. Partners in a relationship return each other's feelings. b. Partners in a relationship supply what the other lacks. c. Each person in a relationship is capable of being a brick or a balloon when the need arises. d. Each person in a relationship is a balance of passion, commitment, and intimacy.

Andy Meltzoff's finding that infants imitate live faces from birth is explained by the function of _____

a. Sensory neurons b. Motor neurons c. Recognition neurons d. Mirror neurons