Buddhist monks and Catholic nuns boost their brain power through meditation and prayer, but even atheists can enjoy the mental benefits that believers derive from faith, according to a popular neuroscience author.

The key, Andrew Newberg argues in his new book "How God Changes Your Brain", lies in the concentrating and calming effects that meditation or intense prayer have inside our heads.

Brain scanners show that intense meditation alters our gray matter, strengthening regions that focus the mind and foster compassion while calming those linked to fear and anger.