Laughter and the brain
출처 : http://en.wikipedia.org/wiki/Laughter
Neurophysiology indicates that laughter is linked with the activation of the ventromedial prefrontal cortex , that produces endorphins . [ citation needed ]
Scientists have shown that parts of the limbic system are involved in laughter. [ citation needed ] This system is involved in emotions and helps us with functions necessary for humans' survival. The structures in the limbic system that are involved in laughter: the hippocampus and the amygdala . [ citation needed ]
The December 7, 1984, Journal of the American Medical Association describes the neurological causes of laughter as follows:
- "Although there is no known 'laugh center' in the brain, its neural mechanism has been the subject of much, albeit inconclusive, speculation. It is evident that its expression depends on neural pathsarising in close association with the telencephalic and diencephalic centers concerned withrespiration . Wilson considered the mechanism to be in the region of the mesial thalamus ,hypothalamus , and subthalamus . Kelly and co-workers, in turn, postulated that the tegmentum near the periaqueductal grey contains the integrating mechanism for emotional expression. Thus, supranuclear pathways, including those from the limbic system that Papez hypothesised to mediate emotional expressions such as laughter, probably come into synaptic relation in the reticular core of the brain stem. So while purely emotional responses such as laughter are mediated by subcortical structures, especially the hypothalamus, and are stereotyped, the cerebral cortex can modulate or suppress them."
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