Goosebumps are the result of piloerection, a temporary raising of the hairs on the surface of the skin that occurs when the piloerector muscles contract. Piloerection is a voluntary response directed by the sympathetic nervous system (the one that triggers the “fight or flight” response), and is elicited by cold, fear or a startling experience. Goosebumps are not only elicited by cold or fear but by emotional experiences because your emotional brain is primal. This is why you can get goosebumps when listening to particular songs or extreme feelings. You can learn more about goosebumps and the reason for getting them here: https://science.howstuffworks.com/life/inside-the-mind/human-brain/goosebumps.htm
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