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Nerve signals that tell the brain that we are being slowly stroked on the skin have their own specialised nerve fibres in the skin.

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Basically the signals that tell the brain that we are being stroked on the skin have their own direct route to the brain, and are not blocked even if the brain is receiving pain impulses from the same area. In fact it’s more the opposite, that the stroking impulses are able to deaden the pain impulses.

Science Daily