The human face, even under the limitations imposed by Parkinson’s disease, continues to reveal the living presence of emotion—albeit in a subtle and often invisible way, argues Prof. Freitas-Magalhães, the world's leading expert for Neuroscience and Biobehavioral Psychology and the Encyclopedia of Human Behavior, by Elsevier, Oxford, n this new and extraordinary book on the 20-year longitudinal research of Parkinson and facial expression of emotion.