People using prescription stimulants for enhancement reported benefits in energy and motivation at least as strongly as benefits in cognition. A survey of perceived effects cannot determine whether their objective performance actually improved.
Ilieva and Farah presented original survey results from 40 university undergraduates without a self-reported ADHD history who had used enhancement stimulants at least once. The paper also discussed earlier experimental and survey research.
The original survey asked about perceived cognitive and motivational effects. It did not administer a controlled amphetamine dose, independently verify each preparation, or test performance while participants were taking the drug.
Participants rated effects on factors including energy, motivation and attention. Motivational effects were perceived as at least as pronounced as cognitive effects. That distinction offers a possible explanation for why users may value a drug even when objective enhancement on some tasks is limited.
However, the participants’ impressions do not establish that motivation caused a real performance gain. Their reports also cannot isolate an amphetamine-specific effect from effects of other enhancement stimulants represented in the survey.
Participants differed in frequency of prior use, and some had used a stimulant only once. Recalling experiences across different occasions introduces uncertainty about dose, context, expectations and sleep.
The small, selected university sample cannot estimate the prevalence of benefits in all students or all users. People who elect to use stimulants may also differ from those who do not.
Feeling more willing to begin work, finding a task more interesting and completing it more accurately are different outcomes. They may coincide, but one should not be substituted for another without measurement.
This paper provides primary evidence about perceived experience, not proof of universal cognitive enhancement, treatment efficacy or individual impairment. Forensic opinions should not infer actual competence solely from a person’s report of feeling focused or energetic.
Related reading: Self-report and urine outcomes can disagree.