This book examines the role of extraversion in relation to stress, perceived energy, and health status. In particular, 4 studies are presented along with an extensive literature review linking extraversion to each of these variables. To guide the reader, the sections of the text are categorised along three models of the causal primary hypotheses, specifically that personality, in particular, extraversion, causes or influences behaviour. Based on these models it is speculated that extraversion is a construct distinct from perceived state energy, that perceived energy and extraversion interact with daily stress to impact health status, and that perceived energy mediates the extraversion and stress to health status/stress relationships.

Much of contemporary psychological research on humor is based on the assumption that a sense of humor is a positive and desirable personality characteristic that enhances psychological health and well-being. Researchers generally assume that individuals with a greater sense of humor possess a number of other desirable traits, such as great optimism, self-acceptance, self-confidence and autonomy. Humorous people are also thought to be able to cope more effectively with stress, to generally experience less negative moods such as depression and anxiety, to enjoy greater physical health, and to have more positive and healthy relationships with others. This book explores the relationship between humor and stress in relation to psychological health and well-being.