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Hedonic hotspots
Pleasure is produced in cubic-millimeter regions of the brain.
Kent Berridge's lab at the University of Michigan has spent thirty years mapping where pleasure is generated. They identified cubic-millimeter 'hedonic hotspots' in the ventral pallidum and nucleus accumbens where opioid stimulation doubles or triples the pleasure response to taste. Analogous hotspots have since been mapped for several other neurotransmitter classes.
Peciña & Berridge, J. Neuroscience 2005 · Smith & Berridge 2005 · Castro & Berridge 2014
What hasn't been tried
Every published experiment uses acute stimulation to study mechanism. No one has attempted chronic enhancement of these hotspots for sustained hedonic elevation in healthy individuals.