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Table 3 Vignette dimensions and levels used in this study: experimental variation of five drug characteristics and three characteristics of the social environment

From: Evaluating the drivers of and obstacles to the willingness to use cognitive enhancement drugs: the influence of drug characteristics, social environment, and personal characteristics

Dimension Levels
Peer prevalence A student considers using a prescription drug to enhance her memorization skills for her exam preparation. From a medical point of view, this is not necessary. This student knows that
▪ none
▪ every second
▪ every one
of her friends or acquaintances uses such substances.
Social suggestions She
▪ never
▪ sometimes
▪ very often
gets suggestions from others to try such means.
Magnitude of enhancement effect By taking such drugs, she hopes to increase the amount of memorized information by
▪ 5 percent
▪ a factor of two
▪ a factor of three
compared to her normal state.
Probability of enhancement effect From a recently published study, she knows that that the effect occurs with a
▪ 5
▪ 50
▪ 100
percent chance.
Probability of side effects This study also reported that
▪ one of 1,000,000 users
▪ one of 1,000 users
▪ every user
Severity of side effects developed
▪ very light
▪ moderate
▪ very strong
depression. Further side effects are unknown.
Drug price Someone can provide her with a package of 10 pills for
▪ free.
▪ 20 Euros.
▪ 100 Euros.
This is enough for 20 learning hours.
Social disapproval The use of such drugs would cause
▪ no
▪ moderate
▪ very strong
  criticism in her environment