Which of the three major systems of the personality operates on the pleasure principle, according to the theory of the psychodynamic perspective?

The Seattle Longitudinal Study examined crystallized and fluid intelligence across the lifespan. What did the study find regarding perceptual speed? It:

a. remained consistent with crystallized intelligence. b. leveled off and maintained throughout the adult years. c. increased steeply throughout the adult years. d. declined steeply throughout the adult years.

Psychological tests are important because

a) people differ in the amount they exhibit of certain traits b) tests are used to make decisions about people c) tests can tell us what a person does best d) tests are easy to develop and cheap to administer