Schizophrenia is seen equally throughout the world.

Which of the following is accurate regarding posttraumatic stress disorder (PTSD)?

a. It has been linked to genetic differences in serotonin functioning. b. Researchers have found minimal support for genetic causes. c. It can lead to desensitization of the amygdala. d. It has been linked to genetic differences in the size of the amygdala.

What is the irresistible urge to perform a particular act over and over again?

a) psychosis b) obsession c) compulsion d) separation anxiety