Coffee's caffeine jolt in your head?

September 2, 2011 7:25:15 PM PDT
A new study says coffee's caffeine jolt may be in your head.

Researchers tested the mental performance of 88 volunteer coffee-lovers.

Some were given caffeinated coffee, and told it was decaffeinated.

Others were served caffeinated coffee and told it was decaf.

Those who drank decaf but were told it had caffeine performed the best.

Researchers say that caffeine jolt may simply be about anticipation.