Medications for attention-deficit hyperactivity disorder (ADHD), such as Adderall, may not improve cognition in healthy students and may actually impair working memory, according to a new study by researchers at the University of Rhode Island (URI) and Brown University.
When administered to healthy (non-ADHD) college students, the standard 30 mg dose of Adderall did in fact improve attention, mood and focus — typical results from a stimulant — but these effects failed to translate to better performance on a battery of neurocognitive tasks that measured short-term memory, reading comprehension and fluency.
The findings, recently published in the journal Pharmacy, surprised the researchers.
“We hypothesized that Adderall would enhance cognition in the healthy students, but instead, the medication did not improve reading comprehension or fluency, and it impaired working memory,” said Dr. Lisa Weyandt, professor of psychology and a faculty member with URI’s George and Anne Ryan Institute for Neuroscience.
“Not only are they not benefiting from it academically, but it could be negatively affecting their performance.”
Weyandt conducted the study with Dr. Tara White, assistant professor of research in behavioral and social sciences at Brown University. Their study is the first multi-site experiment investigating the impact of so-called “study drugs” on college students who do not have ADHD.
It comes at a time when use of prescription stimulants such as Adderall, Ritalin and Vyvanse is common among young adults who believe the drugs enhance their academic performance. Research has estimated that 5 to 35 percent of college students in the United States and European countries without ADHD illegally use these controlled substances, buying or receiving them from peers, friends, or family.
The findings show that a 30 mg dose of Adderall did improve attention and focus, but that effect failed to translate to stronger performance on a battery of neurocognitive tasks that measured short-term memory, reading comprehension and fluency.
Weyandt has a theory about why working memory would be negatively impacted by the medication: Brain scan research shows that a person with ADHD tends to show less neural activity in brain regions that control executive function — working memory, attention, self-control. For those with ADHD, Adderall and similar medications increase activity in those regions and appear to normalize functioning.
“If your brain is functioning normally in those regions, the medication is unlikely to have a positive effect on cognition and my actually impair cognition. In other words, you need to have a deficit to benefit from the medicine,” Weyandt said.
The study participants also reported their perceived effects of the drug and its impact on their emotions, with students reporting significant elevation of their mood when taking Adderall.
In contrast to the small, mixed effects on cognition, Adderall had much larger effects on mood and bodily responses, increasing positive mood, emotional ratings of the drug effect, heart rate and blood pressure.
“These are classic effects of psychostimulants,” said White. “The fact that we see these effects on positive emotion and cardiovascular activity, in the same individuals for whom cognitive effects were small or negative in direction, is important.”
“It indicates that the cognitive and the emotional impact of these drugs are separate. How you feel under the drug does not necessarily mean that there is an improvement in cognition; there can be a decrease, as seen here in young adults without ADHD.”
The physical effects from the drugs, such as increased heart rate and blood pressure, were expected, and underscored the difference with cognition.
“They are subjecting themselves to physiological effects but do not appear to be enhancing their neurocognition,” Weyandt said. She emphasized, however, that the findings are based on a pilot study and need to be replicated with a substantially larger sample of college students.
The researchers recruited students from both universities, eliminating those who had taken ADHD medications or other drugs. After rigorous health screenings, 13 students participated in two five-hour sessions.
In the double-blind study, in which neither the researchers nor the participants knew who was receiving the placebo and who was receiving the drug, each student received Adderall in one session and the placebo in the other. This allowed the researchers to observe the effects of the medication vs. placebo in individuals and across the group.
Source: University of Rhode Island
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