The systematic study of pleasure, its psychological basis, and its role in human motivation and behavior.
From Greek 'hedonē' (pleasure) plus '-logy' (study of), a 20th-century academic coinage for the formal scientific investigation of pleasure as a measurable phenomenon in psychology and neuroscience.
Hedonology is a real research field—scientists studying it have discovered that humans can actually 'adapt' to pleasure, which is why your favorite song eventually becomes background noise and you need novelty to feel joy again.
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