Professor Yassa says their answers help to show the effects of caffeine on memory.
He says those who took the caffeine pills had a ten to twelve percent increase in their ability to remember the objects. The amount of caffeine the researchers used in the study was similar to one strong cup of coffee.
Professor Yassa says pills with a little more coffeine also increased memory, but resulted in some participants appearing more nervous.
And thats the Health Report from Learning English. For more stories about health, go to our website 51voa.com. Im Christopher Cruise.
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