Pain and pleasure
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For the Klinik EP, see Pain and Pleasure (EP). For other uses with similar titles, see Pleasure and Pain.
Some philosophers, such as Jeremy Bentham, Baruch Spinoza, and Descartes, have hypothesized that the feelings of pain (or suffering) and pleasure are part of a continuum.
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There is strong evidence of biological connections between the neurochemical pathways used for the perception of both pain and pleasure, as well as other psychological rewards.