Music keeps the happy center in your brain guessing. Is the good part of the song going to be now, maybe latter, maybe after this riff, and then BAM – all those happy (dopamine) triggers get pulled and you get goose bumps. Note: as with all thing has to do with the brain, scientists are still not 100% sure. Why is brain high jacking the function for cold weather reaction and linking it with the pleasure center? We don’t know.
Goosebumps are an evolutionary vestige from a time when we had fur. When hairy mammals experience events or stimuli such as mating, competition or defense (adrenaline spikes), the skin pores that hold hairs stand more upright making animals appear larger. Cold weather also triggers this response, the hairs stand more upright capturing more air in between each hair creating a natural insulation like a parka jacket.
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