2

 responding, facial behavior, and verbal report were measured

 during "in vivo" affective situations.

 Before discussing the experiments further, a brief

 overview of the literature is provided. The review includes

 prominent theories of emotion which have stemmed from the

 works of James (1884/1922), Lange (1922), and Cannon (1927).

 Moreover, theories of hemispheric specialization of emotion

 are provided. Specifically, two predominant

 neuropsychological theories of emotion are explored: (1)

 the global right hemisphere theory which states that the

 right hemisphere is responsible for affective processing;

 and (2) the bivalent view which conceptualizes the right

 hemisphere as predominant for negative emotions and the left

 hemisphere as predominant for positive emotions. In

 addition, studies of hemispheric differences in emotional

 evaluation, expression, arousal, and mood are discussed.

 Lastly, an overview of emotional psychophysiology is

 presented.

 Theories of Emotion

 The quest to understand emotion has stimulated the

development of many theories and much empirical data over

the past century. According to Kleinginna and Kleinginna

(1981) the numerous definitions of emotion complicate

research in emotion. After an extensive review of emotional

definitions, they classified psychological definitions of

emotions into 11 non-mutually exclusive categories on the