The nature of consciousness is a subject of enormous interest to both science and religion. Modern, secular mindfulness techniques have their foundation in ancient Buddhist thought, but it's only recently that neuroscientists have given serious attention to what actually happens in the brain when we meditate. Dr Sara Lazar is Associate Professor of Psychiatry at Harvard Medical School, and leads the Lazar lab for Meditation Research at Massachusetts General hospital. She is one of the world's leading researchers into the impact of mindfulness techniques on the brain, and has been a yoga and meditation practitioner since 1994. The Venerable Thubten Dondrub is resident teacher at Buddha House in Adelaide and has been an international teacher with the Foundation for the Preservation of the Mahayana Tradition for nearly 50 years.