Five-year-old Otto is watching a group of children who are playing with Lego blocks. Occasionally, he says things like "that's a neat car" or "want some blocks?" However, he does not sit down and play with the Legos himself. This best demonstrates which form of play?

What is one of the factors that complicates treatment of antisocial personality disorder?

a. poor verbal skills b. low level of overall intelligence c. high rates of comorbid alcoholism and other substance dependence d. strong emotional ties to therapists that represent parental figures

How does the action of methamphetamine differ from that of cocaine?

a) Methamphetamine and cocaine stimulate different neurotransmitters b) Methamphetamine suppresses appetite, whereas cocaine does not c) Methamphetamine stays in the body longer than cocaine does d) Methamphetamine increases CNS activity, whereas cocaine depresses it