Within-subjects experiments always have

What is associated with the destruction of neurons that release a neurotransmitter called acetylcholine?

a. vascular depression b. amnesia c. vascular dementia d. Alzheimer's disease

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.