Book excerpt: Emotions: from brain research to computer game development / Robert Trappl / - A theory of emotion, its functions, and its adaptive value / Edmund T. Rolls / - How many separately evolved emotional beasties live within us? / Aaron Sloman / - Designing emotions for activity selection in autonomous agents / Lola D. Cañamero / - Emotions : meaningful mappings between the individual and its world / Kirstie L. Bellman / - On making believable emotional agents believable / Andrew Ortony / - What does it mean for a computer to "have" emotions? / Rosalind W. Picard / - The role of elegance in emotion and personality : reasoning for believable agents / Clark Elliott / - The role of emotions in a tractable architecture for situated cognizers / Paolo Petta / - The Wolfgang system : a role of "emotions" to bias learning and problem solving when learning to compose music / Douglas Riecken / - A Bayesian heart : computer recognition and simulation of emotion / Eugene Ball / - Creating emotional rel ...