You can't take that statement at face value. Part of the point of prayer is to focus your mind and block out irrelevant thoughts and stimuli. (Is it not?) I'd like to see how brain activity of people praying compares to those in meditation.
The changes in the brain's functioning during meditation are pretty amazing. This has been researched pretty well with buddhist monks, etc.
What's the actual phenomenon being measured here? Is it a shutting down of skepticism due to prayer, or due to trust, or something else?