Eigenpoll : Cognitive improvement : Tibetan Exercise of Paradox 

This is a form of mental training.
That gives you the ability to think on 4 things
at the same time.

Make a google search on 'The Tibetan Exercise of Paradox' and you will find a description.

You can also try to find this pdf.
Tibetan-Paradox-Whole-Brain-Exercise.pdf

http://humanityhealing.net/wp-content/uploads/2010/10/Tibetan-Paradox-Whole-Brain-Exercise.pdf