For Her New Study, Professor Smart Decides to Measure Infants

Multiple Choice

For her new study, Professor Smart decides to measure infants' heart rate as well as their cortisol levels when they see pictures of snakes and butterflies. What is one of the advantages of including both of these measures?

A) They provide complementary information about infants' immediate and delayed responses to the stimuli.
B) They measure responses in the autonomous and the central nervous system.
C) They can easily be measured with the same device.
D) All of the above.