Also important is the ability to learn and to remember the results of the mental activity.

Learning is a mental activity and its efficiency has always been fairly low.

Instead, it is about entities that we can create directly through mental activity.

But learning does, of course, imply memory and mental activity.

Adolescents are much better able than children to understand that people do not have complete control over their mental activity.

But the Doctor had no brain to play with, and would immediately see the mental activity on his medical instruments.

If you concentrate hard enough, your mental activity will slow down.

It is misleading to talk of thinking as a mental activity.

There seemed to be almost no mental activity in the normal sense.

There seems to be quite a bit of mental activity.