Narcolepsy is primarily associated with impairments in

Which of the following is most clearly not an example of an incentive?

a. a crossword puzzle b. a pornographic movie c. low blood glucose level d. the smell of rotten eggs

Experiments are more valuable than other research methods because:

a. they are always double-blind. b. they can determine correlations. c. they require informed consent. d. they allow a determination of cause-effect relationships.