The power of a caffeine-filled coffee fix may be all in the mind, British researchers said Friday.

A study by the University of East London found that self-confessed coffee addicts who were given a decaffeinated placebo performed better in reaction time tests than caffeine-consuming participants.

The 88 volunteers, aged between 18 and 47, drank at least two cups of coffee a day for the research and all reported that their mood and performance improved after the drink.

However, those who unwittingly consumed decaffeinated coffee reacted quicker in tests than those who consumed the caffeinated drinks.

"The findings suggest the expectation of having consumed caffeine confers an enhancement on sustained attention that is at least comparable, and perhaps superior to, the effects of caffeine," the researchers wrote in the journal Appetite.

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