These typically improve concentration and a few areas of cognitive performance, but only while the drug is still in the blood.

"Lack of sleep may lead to a general decline in cognitive performance and not just memory."

Tyrosine does not seem to have any significant effect on mood, cognitive or physical performance in normal circumstances.

However it did slightly reduce cognitive performance in tests on monkeys.

At first, the new environments seemed to boost cognitive performance.

This function of the brain is critical to normal cognitive performance in everyday life.

However this study was limited to cognitive performance in childhood.

Many previous studies highlight the importance of sleep in cognitive performance.

The study did not measure the subjects' cognitive performance.

The crew conducted an experiment which tracked their cognitive performance throughout the mission.