Cannon-Bard
Summary
The Cannon-Bard theory says the feeling of an emotion and the body's physiological arousal occur at the same time and independently, both triggered by thalamic signals after a stimulus. The key test point is timing: James-Lange puts arousal first, Cannon-Bard puts it simultaneous with the emotion.
Detail
Meaning: The Cannon-Bard theory says the feeling of an emotion and the body's physiological arousal occur at the same time, and neither causes the other. A stimulus is relayed through the thalamus, which signals the cortex (producing the subjective feeling, such as fear) and the autonomic system (racing heart, sweating) in parallel. It was proposed partly as a criticism of James-Lange, since similar bodily changes can accompany different emotions.
On the MCAT: A short scenario, such as seeing a bear on a trail, asks which theory fits. Know the sequences. Cannon-Bard: stimulus → arousal and emotion at once. James-Lange: stimulus → arousal → emotion. Schachter-Singer (two-factor): stimulus → arousal plus a cognitive label → emotion. Evidence that people can feel emotion without bodily feedback, or that the same arousal accompanies different emotions, challenges James-Lange.
Common confusion: Students mix up Cannon-Bard and James-Lange because both involve physiological arousal. Settle it by timing: arousal before the emotion is James-Lange, and simultaneous arousal and emotion is Cannon-Bard. Cannon-Bard has no cognitive appraisal step; adding a cognitive label to arousal is Schachter-Singer.
Sources
- Psychology (Myers)
- Psychology (Schacter, Gilbert, Wegner)
Written for the MCAT and checked before it was published. For study reference only. Spotted an error? Let us know.