Caffeine plus brain stimulation improved selected cognitive test results
An acute randomized experiment found gains in working-memory accuracy and some Stroop comparisons, while a task-switching test showed no significant differences among groups.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
Combined stimulation and caffeine improved working-memory accuracy versus sham stimulation plus placebo at both post-treatment assessments. Some other task comparisons also favored active treatment, but task-switching results were nonsignificant. The reported comparisons do not establish that combining treatments consistently outperforms either treatment alone, or that laboratory gains translate into better everyday functioning.
The abstract reports statistical significance without effect sizes or confidence intervals. It describes an acute experiment in female participants, so it cannot establish how large, durable, or broadly applicable any benefit might be.
What researchers found
3-back working-memory task
Combined treatment versus sham stimulation plus placebo immediately afterward and following a 30-minute rest; the effect size was not reported.
Results depended on the task
On the Stroop task, the combination improved immediate accuracy compared with caffeine plus sham stimulation and with the double control. The task-switching test showed no statistically significant differences among the treatment groups.
Different timings do not prove superiority
Separate stimulation and caffeine groups also improved working-memory accuracy versus the double control, at different assessments. This abstract-based account cannot infer combination superiority merely because its significant results appeared at more testing times.
The original publication
Transcranial direct current stimulation combined with caffeine promotes executive function in healthy females.
Yuan W, Nitsche MA, Yue T et al.
J Int Soc Sports Nutr · 2025
- PubMed ID
- 40888092
- Record checked
AI-assisted research and writing. This explains one selected publication; it is not a complete review of everything known. Our approach.
One more question, understood.
Keep track of the research you’ve explored.