'As science advances in the exploration of the nature of feelings, there is an emerging trend: we are forced to move closer to origins, at the scale of both historical evolution and individual development. In either case, we move closer to life. Daniel Stern, whose studies of the non-verbal interactions of mothers and infants are a landmark, contributes to this trend by investigating the experience of vitality, a composite experience drawn from movement, force, time, space and intention. Here is an important meditation on a central aspect of humanity.' - Antonio Damasio, Director, Brain and Creativity Institute, University of Southern California, USA