But this is not a matter of structure but mental performance.

The drugs do improve the mental performance of people who are fatigued.

By now it might be wondered whether there is any satisfactory way to measure mental performance.

What do these tests tell us about mental performance?

This applies to both your physical and mental performance.

The impact of lead on the brain does not cause "very slight changes in mental performance."

Medical experts say some people, although nobody knows how many, are using the drug simply to improve their mental performance.

It is also used to improve mental performance and as an antioxidant.

In fact, their mental performance on standard tests was actually somewhat better.

Since that first study, numerous others have found similar, very slight changes in mental performance caused by lead exposure.