How does a PET scan provide information about the functioning of the brain?
a) A computer interprets X-rays.
b) It makes a record of radio waves directed to the brain.
c) It monitors the radioactivity level of different areas of the brain.
d) It records electrical activity from electrodes placed on the skull surface.
ANS: c
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Padma is extremely confident and feels that lately she needs very little sleep. In addition, she reports that her thoughts seem to be going fast—similar to watching three television shows at once. Padma most likely is experiencing ________
a) a manic episode b) a dysthymic episode c) a loss of mental control d) a psychotic break
DSM-5 uses the descriptive approach to classify abnormal behavior because experts do not know what causes mental disorders and because it
a. helps diagnose the underlying cause of a mental disorder. b. is easier to understand. c. helps professionals to agree about the presence or absence of an emotional problem. d. categorizes behavior with a known mental disorder.