During which period of life does a natural change occur in the human sleep-wake cycle?

In an experiment, hypnotized subjects are told to scratch their ear if they hear the word "psychology" mentioned later. The fact that they do so only if they think the experiment is still under way most clearly supports the theory that hypnosis involves:

a. dissociation. b. neuroadaptation. c. role playing. d. hypnagogic sensations.

A serious side effect of lithium treatment is related to

a. toxicity from high blood levels of lithium. b. gastric distress. c. a complaints of halitosis. d. the development of severe depression. e. a worsening of manic episodes.