For example breathing techniques help in concentration "The Yogi masters were right – breathing exercises can sharpen your mind. New research explains link between breath-focused meditation and brain health" http://www.tcd.ie/news_events/articles/the-yogi-masters-were...

Not to mention the link between psychology conditions, like anxiety, depression, etc. and breathing. Studies show that breathing techniques help improve mood, and in fact inviduals that have improper breathing, or arrhythmic breathing also tend to be afflicted by certain psychological ailments which when improved also reduce, and in some cases cure individuals.