The point at which a person can detect a stimulus 50 percent of the time it is presented is called the

According to Chomsky's nativist view of language acquisition:

a. humans are born with a hard-wired set of principles and rules that govern learning grammar in all languages b. grammar is a by-product of the growth of vocabulary and increasingly complex thought c. learning new words is a domain general skill that develops through connectionism d. children learn language primarily through imitation and operant conditioning

In the early 1900s in the U.S., fears about opium and cocaine were closely linked to

A. large numbers of drug-related deaths. B. gang-related violence. C. minority racial groups. D. public use in saloons and night clubs.