“ Caffeine's memory-boosting effectiveness has been a controversial issue for many years. Distinguishing human alertness from caffeine's natural alertness is not easy.
Caffeine's memory-enhancing effects have been a controversial issue for many years. Distinguishing human alertness from caffeine's natural alertness is not easy.
In the study, experts at Johns Hopkins University in Baltimore, Maryland, USA, asked 73 volunteers to observe some objects. They were then divided into two groups, one to drink strong espresso (2 cups equals 200 mg of caffeine) and the rest to take a fake pill called a placebo.
Volunteer saliva samples were tested for 1 hour, 3 hours and 24 hours thereafter to measure caffeine intake. One day later, they were asked to continue with the initial experiment with many duplicate, similar and different images from the previous images.
The results showed that both groups were able to distinguish old and new images in the experiment. However, those who were better able to observe and detect a difference or similarity between the images clearly were the coffee drinkers.