I know a little about neurology, but their study mentioned increase in hippocampus. Hippocampus Wikipedia entry does not mention that it is responsible for breath or metabolism. Some Google searches list different parts of brain responsible for breath[1] and metabolism[2].

1. http://www.interactive-biology.com/107/what-parts-of-the-bra... 2. https://en.m.wikipedia.org/wiki/Hypothalamus