responses, it is unknown whether there is a disconnection

between experience and motor output or whether the person is

not experiencing the emotion as completely as someone who

reacted with all three response systems.

 Hemispheric Asymmetry of Emotion

 Along with general psychological theories of emotion,

 investigators have examined the organization of emotion in

 the brain. Historically, emotion has been associated with

 the limbic system (Papez, 1937; MacLean, 1952). More

 recently, neuropsychologists have examined the role of the

 cerebral hemispheres in modulating emotional behavior.

 Research involving neurologically impaired patients has

 aided in developing an understanding of how various domains

 of emotional behavior (i.e., evaluation, expression,

 arousal) are disrupted by focal lesions of the left and

 right hemispheres. Based on some clinical studies, along

 with findings from normal individuals (see review, Heilman,

 Bowers, & Valenstein in press), inferences have been made

 regarding the neural networks that might underlie different

 aspects of emotional behavior including evaluation,

 expression, arousal, and experience.

 Early observations of individuals following hemispheric

damage revealed differences in mood reactions depending on

whether the left or right hemisphere was involved.

Babinski (1914) was one of the first to note that patients

with right hemisphere damage (RHD) appeared indifferent or