As Stormgren talked, it seemed to him that his mind was operating on two levels simultaneously.

In this we have the visible factors of how the reactive mind operates.

It can't be perfect without thinking exactly like its original; the same mind must operate the same way.

Brad's mind operated far more subtly than most people suspected, and he never gave up on a problem.

So my mind operated on his in this instance.

For the next dozen hours, my mind operated along parallel tracks.

I have no idea how his mind operates in those matters.

At the computer, her hands and mind operate at close to digital speed.

They were talking too fast, or perhaps his mind was operating at a reduced pace.

He created his math based upon the way our own minds operate.