i.e., fleeing from a dangerous snake. LeDoux proposed that

 the amygdala receives exteroceptive sensory, interoceptive

 sensory, and neural input. In addition, LeDoux (1984)

 explains that sensory information from the peripheral

 nervous system feeds back to the amygdala to intensify

 amygdala excitation and increase the duration and intensity

 of the experience of emotion.

 LeDoux suggested that the amygdala performs the

 functions that Cannon (1927) and Papez (1937) thought

 belonged to the hypothalamus. Together, Cannon, Papez, and

 LeDoux challenged the James-Lange Theory in hypothesizing

 that emotional experience can be generalized in the brain

 without the participation of the peripheral nervous system.

 However, none of these theories discuss the differing roles

 that the right and left cerebral hemispheres may play in

 modulating emotional behavior.

 Appraisal Theories

 Other theorists have attempted to address Cannon's

criticism of autonomic feedback proposed by James and Lange.

Russell (1927/1961) stated that cognition as well as

physiological feedback compose the experience of emotion.

Within the past few decades, some theorists have viewed

emotion as a phenomenon developing from cognitive appraisal

of an event, situation, or condition. Arnold (1960)

described emotion as the nonrational judgement of an object

which follows perception and appraisal. Schacter and Singer