Discuss what balanced placebo and longitudinal designs can tell us about the possible role of expectations as factors in both alcohol and drug effects and in the onset of alcohol and drug problems
Answer:
Using the balanced placebo design, researchers have shown that subjects' expectations about how a drug will affect their behavior can account for many of the effects that are usually attributed to the drug itself. For example, subjects who believed they had ingested alcohol but who had actually consumed only tonic water displayed exaggerated aggression and reported enhanced feelings of sexual arousal. Expectations may constitute one of the primary reasons for continued and increasingly heavy consumption of alcoholic beverages. Longitudinal studies have found that adolescents who initially have the most positive expectations about the effects of alcohol go on to consume greater amounts of alcoholic beverages.
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