In research conducted by Pope and McNally (2002), participants diagnosed with repetitive-stress injury (RSI) were placed in one of three groups: no treatment (the no-treatment group); a magnetized wristband (the magnet group); and, unbeknownst to the participants and the researcher, a wristband with the magnet removed (the sham group). On a post-test, the sham group performed as well as those in the magnet group. What might explain the results of the study?

In the DSM-V, what was moved out of the somatoform category and into the OCD and related disorders category?

a. blood-injection-injury-phobia b. anorexia nervosa c. agoraphobia d. body dysmorphic disorder

Which of the following statements supports the "preserve and protect" hypothesis of sleep?

A) People tend to require more sleep after a hard day of work. B) Sleep deprivation can lead to impaired cognitive abilities. C) Jet lag is usually worse when traveling east than it is when traveling west. D) Many small animals sleep during the day, when they could be easily seen by a predator.