Brain scans confirm what many coffee drinkers already know -- caffeine perks them up.
The caffeine found in coffee, tea, soft drinks and chocolate stimulates areas of the brain governing short-term memory and attention, Austrian researchers said on Wednesday.
Functional magnetic resonance imaging scans performed on the brains of 15 subjects who had just consumed caffeine equal to that found in two cups of coffee showed increased activity in the frontal lobe where the working memory is located and in the anterior cingulum that controls attention.
“We are able to see that caffeine exerts increases in neuronal activity in distinct parts of the brain going along with changes in behavior,” said Austrian researcher Dr. Florian Koppelstatter of the Medical University Innsbruck.
Participants who were subjected to a 12-hour period without caffeine and a four-hour period without nicotine, another recognized stimulant found in cigarettes, were better able to remember a sequence of letters after consuming 100 milligrams of caffeine. Reaction times on short-term memory tests also improved.
Caffeine is the world’s most widely used stimulant, according to the research presented at the annual meeting of the Radiological Society of North America. Global daily consumption of caffeine averages 76 milligrams, equal to 1 1/2 cups of coffee. In the United States, average consumption is 238 milligrams per day, equal to that found in 4 1/2 cups of java.
