Experiencing and detecting happiness in humans: The role of the supplementary motor area

Abstract
Understanding emotions in others may involve neural structures implicated in both perception and action.1 Laughter is a socially important behavior and its neural correlates are poorly understood. Depth electrode electrophysiological techniques offer a rare opportunity to both record and stimulate neural structures involved in emotion processing.2, 3 This kind of direct electrophysiological investigation in humans is particularly determinant because laughter processing cannot be studied in animals. Ann Neurol 2005