PERSON
Kent Berridge
The neuroscientist who discovered that wanting and liking are separate brain systems—a dissociation that explains addiction, the compulsion loop of AI-assisted work, and why a builder who cannot stop prompting at three in the morning is experiencing not passion but the dopamine system running on a track from which the pleasure has quietly departed.
In 1989, Kent Berridge performed an experiment that would take thirty years to reach its full implications. He depleted rats of nearly all their dopamine—the neurotransmitter that popular science had crowned “the pleasure chemical”—and watched them starve beside piles of food they still demonstrably enjoyed when it reached their mouths. The rats
liked what they got. They had entirely lost the
wanting to pursue it. This single dissociation launched a research programme at the University of Michigan that has spent three decades mapping the distinct neural substrates of desire and pleasure, demonstrating with increasing precision that
wanting and liking are anatomically separate, chemically distinct, and functionally dissociable. The dopamine system—the
mesolimbic pathway—generates
incentive salience: the motivational urgency that makes a cue irresistible, that drives pursuit, that tells the organism
this, now, is worth getting. The opioid-endocannabinoid system, operating through