Caffeine may boost memory

New research suggests scientists have found the first clear evidence of caffeine's memory-boosting effect and shows that it lasts at least 24 hours.

Volunteers took part in a double-blind trial in which they were given a 200mg caffeine pill or a placebo tablet five minutes after studying a series of images.

Tests a day later proved the memory of those who took caffeine had been enhanced.

The amount of caffeine used was roughly equivalent to a double shot of strong espresso coffee.

US lead researcher Dr Michael Yassa, assistant professor of psychological and brain sciences at Johns Hopkins University in Baltimore, said: "We've always known that caffeine has cognitive-enhancing effects, but its particular effects on strengthening memories and making them resistant to forgetting has never been examined in detail in humans.

"We report for the first time a specific effect of caffeine on reducing forgetting over 24 hours."