Pleasure systems in the brain.
Level 5 - mechanism / opinion, no new human data
Narrative review synthesizing neuroimaging and neurocircuitry models without systematic review methodology or new empirical data.
PubMed 25950633 · doi:10.1016/j.neuron.2015.02.018
What was done
This review synthesized human neuroimaging and neurobiological evidence regarding mesocorticolimbic reward circuitry, examining how the brain processes sensory pleasure, motivation, and hedonic dysfunction in affective disorders.
What was found
The abstract provides no quantitative metrics or sample sizes. Conceptually, it reports that diverse pleasures activate common mesocorticolimbic circuitry, indicating a shared neural mechanism. The review highlights a functional dissociation where reward-seeking ('wanting') relies on a large distributed brain system, whereas hedonic pleasure ('liking') is restricted to localized hedonic hot spots within limbic structures. Additionally, classic targets historically linked to pleasure generation, such as mesocorticolimbic dopamine pathways and deep-brain stimulation electrodes, appear not to generate pleasure directly.
Why it matters
Distinguishing between the discrete neural circuits responsible for pleasure versus motivation provides a conceptual framework for understanding anhedonia and dysphoria, which could inform targeted interventions for affective disorders.
Limits
The abstract describes a broad narrative synthesis rather than a systematic review or meta-analysis. It does not provide quantitative data, study inclusion criteria, or specific population demographics, and it relies heavily on preclinical models and neuroimaging correlations.
Cited by
- context In 1960s human electrical brain self-stimulation studies by Robert Heath, participants chose to stimulate the central midline nucleus of the thalamus the most, seeking the feeling of mild frustration and anger.