Sandy's favorite activity is to go to Las Vegas and play the slot machines. Her gambling behavior is being reinforced on a ______ schedule
a. fixed-ratio c. variable-ratio
b. fixed-interval d. variable-interval
c
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Although Linda loves to have her friends come over to her house for social events, she declines any offers to go over to other people's houses. In fact, she declines any offers to go anywhere because she fears being out of her house. Linda probably suffers from:
A. a social phobia B. agoraphobia C. a specific phobia D. generalized anxiety disorder
Studies indicate that to have more than one mental disorder any point in time
a. men are more likely than women b. women are more likely than men c. adolescents are more likely than young adults d. the elderly are more likely than young adults
The impairment of memory for previously learned information by newly learned information is known as:
A) proactive interference. B) retrograde amnesia. C) retroactive interference. D) anterograde amnesia.
Which statement about the human immunodeficiency virus (HIV) is true?
A) About 30 percent of all new HIV infections affect women. B) In South Africa, 30 percent of all pregnant women are HIV-positive. C) About 30 percent of new HIV infections occur in developing countries. D) Untreated HIV-infected mothers pass the virus to the fetus 30 percent of the time.