If an infant sticks out his tongue in response to a parent doing the same action, what has occurred?

What can sleep scientists say about people who do not get enough sleep?

a. Their cortisol levels increase. b. They develop sleep apnea. c. They become prone to narcolepsy. d. Their creativity often increases.

What is the main importance of longitudinal studies in the study of personality?

A) To look for consistency and change in personality over time B) To predict future behaviors C) To prevent future generations from making the same mistakes D) To prove non-longitudinal studies incorrect E) To end up with a large amount of data