Gasps, sighs, and yawns are recognized by even a casual observer as involuntary expressions of emotion through the "medium" of respiration. In recent years, scientific observation has focused on sensation and behavior as researchers investigate the relation of emotion and stress in disorders such as asthma, hyperventilation, and panic disorder. Until now, however, the interplay of psychological factors and physiological responses has not been approached from the interdisciplinary perspective reported in this book. Brought together here is the work of physiologists, psychologists, and...