Nociception and the Subjectivity of Pain
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Nociception is the neural processing of injurious stimuli; pain is its perception, and pain tolerance varies among people receiving the same nociceptive stimulus.
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Capsaicin triggers pain receptors by opening the same channels warmth receptors use, without causing tissue damage.
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Nociception at the receptor and pain as a conscious experience are distinct steps — the second does not automatically scale with the first.