The absence of normal levels of sensory stimulation is called _______________

Some believe that twins often share a secret and distinct language. Research suggests that

A) cryptophasia is a true phenomenon for roughly half of all twins studied. B) most twins develop language more quickly than singletons, leaving them free to develop new languages. C) twins may be more susceptible to language delays, which appear to some observers as distinct language forms. D) the secret language of twins is referred to as homesign.

A stimulus presented to a person or animal that decreases the probability of a particular response is known as __________

a) positive punishment. b) negative punishment. c) negative reinforcement. d) negative expectation.