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A biotech company says it put dopamine-making cells into people’s brains | "The experiment to treat Parkinson’s is a critical early test of stem cells’ potential to tackle serious disease."
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Increasing dopamine levels will most likely only increase desire but not pleasure. If there's a pleasure chemical then it's probably opioids or endocannabinoids. But since every chemical has a diverse set of functions in the brain and body, no chemical can be called the pleasure chemical.
The most direct neural origin of pleasure and happiness is not increased levels of a neurotransmitter, but action potentials in specific brain circuits, like hedonic hotspots for example. It doesn't matter by which neurotransmitter these circuits are activated. But thanks for tagging me