Zen and the Brain: Toward an Understanding of Meditation and Consciousness is a book authored by James H. Austin. First published in 1998, the book's aim is to establish links between the neurological workings of the human brain and meditation. For example Austin presents evidence from EEG scans that deep relaxed breathing reduces brain activity.
The publishers described their book as a "Comprehensive text on the evidence from neuroscience that helps to clarify which brain mechanisms underlie the subjective states of Zen, and employs Zen to 'illuminate' how the brain works in various states of consciousness".
Austin is an MD and has also practiced Zen over many years. Later Austin wrote a follow-up, Zen-Brain Reflections.