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Darwin's The Expression of Emotions in Man and Animals was the first major event of the biological bases of emotion. He believed emotions evolved from behaviors that indicated what an animal would do next in a given situation; that when these behaviors were advantageous to the animal.
The James-Lange Theory was the first attempt to explain the physiological bases of emotion' suggests that emotion-inducing stimuli are received and interpreted by the brain, which trigger visceral changes, organ changes in the thorax or abdomen, that subsequently trigger the experience of emotion. With this emotion is the result of one's perception of their reaction or bodily changes.
Canon-Baird Theory is an alternative theory based on the idea that emotional stimuli evoke visceral and emotional responses that are independent of one another. It suggest that there is no mechanism to emotion.
Shortly after Bard worked on the hypothalamic function theory, Papez proposed a limbic system that controlled the expression of emotions by connections with the hypothalamus and mediated the perception of emotions by connections with the cortex.