Appetite. 2011 Jul 29. Expectation of having consumed caffeine can improve performance and mood. (University of East London, London, United Kingdom)
- 88 non-smokers, aged 18-47 years, half female
- Habitual coffee drinkers (>2 cup/day for >6 months)
- Randomly allotted to each group, double-blinded
- Told to receive ordinary cup of caffeinated or decaf coffee
- In fact, half of each group given the other kind of coffee
- 5 min for drinking, 55 waiting before test
- Improvement in attention and psychomotor speed shown with expectancy of caffeine.
| Given caffeinated | Given decaf |
| Told caffeinated | ++ | ++ |
| Told decaf | + | - |
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