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There's nothing like starting the day with a cup of coffee for Brazilians . One of the main reasons for drinking the beverage is the belief that it makes people more alert, which makes people drink it to improve their efficiency. However, Portuguese researchers analyzed groups of people who drink coffee to understand how this "wakefulness effect" works, whether it is dependent on the properties of caffeine, or if it is more linked to the experience of drinking coffee.
According to the study's findings, the caffeine-filled liquid, much loved in the country, helps the brain prepare for work. "Time to focus!" he exclaims to the body.
“There is a common expectation that coffee increases alertness and psychomotor functioning. By better understanding the mechanisms underlying a biological phenomenon, you open up avenues to explore the factors that may modulate it and even the potential benefits of that mechanism,” said Professor Nuno Sousa of the University of Minho in Portugal, corresponding author of the study in Frontiers in Behavioral Neuroscience and chief field editor of the journal.
For the study, people who drank at least one cup of coffee per day were recruited. They stopped eating or drinking caffeinated beverages for at least three hours before the study. The participants were then interviewed by scientists to obtain their sociodemographic data and underwent two functional MRI scans: one before and another 30 minutes after drinking caffeine or a standardized cup of coffee.
The researchers expected the fMRI scans to show that people who drank coffee had greater integration of networks linked to the prefrontal cortex, associated with executive memory, and the default mode network, involved in introspection and self-reflection. However, they found that the connectivity of the default mode network decreased both after drinking coffee and after drinking coffee, indicating that consuming caffeine or coffee made people more prepared to transition from rest to work before starting their tasks.
Coffee as an alarm clock
However, drinking coffee also increased connectivity in the superior visual network and the right executive control network—parts of the brain involved in working memory, cognitive control, and goal-directed behavior. That didn’t happen when participants drank caffeine alone. In other words, if you want to feel not only alert but ready to start your day, you need to experience drinking a cup of coffee.
By Raquel Pereira — O Globo Newspaper
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