In studying the bystander effect, a researcher is interested in looking at differences between prison guards in China and the United Kingdom. The researcher is taking a __________ in this cross cultural study

Ward notices that as his supply of marijuana decreases he starts thinking more and more about where he can get another supply, as well as feeling nervous and anxious. This is an example of _____

A) withdrawal B) psychological dependence C) tolerance D) physical dependence

A mood disorder that occurs in the context of cerebrovascular disease is known as

A) vascular depression. B) Alzheimer's disease. C) vascular dementia. D) pseudodementia.