Self-fulfilling prophecies are expectations about the occurrence of a future event or behavior that act to increase the likelihood that the event or behavior will occur.

Which of the following statements is true?

a. Signals above the threshold of excitation will prevent a neuron from firing. b. The strength (intensity) of a neuron's action potential depends on the strength of its excitation. c. A neuron fires in response to every message it receives. d. Impulses in myelinated neurons may reach speeds of nearly 400 feet per second.

Which school of thought in psychology tried to explain how specific behaviors and mental processes help a person adapt to the environment?

a. phrenology b. structuralism c. functionalism d. psychiatry