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Pleasure in neuroscience
Pleasure is studied in neuroscience. Neuroscientists have mapped pleasure "hotspots" in the brain. Pleasure is important for a person's mental health and well-being. The loss of pleasure is common in people with mental illnesses like depression, schizophrenia, and addiction.
Pleasure in psychology
Pleasure is studied in positive psychology. How much pleasure someone feels changes from person to person. Pleasure depends how special something is. There is no rule that says what pleasure is for every person. 
Sigmund Freud wrote about the "pleasure principle" in the 1920 essay Beyond the Pleasure Principle. According to Freud, the pleasure principle is what drives people to do things that give them a feeling of immediate gratification.
Pleasure in philosophy
- "Videos of Pleasure-elicited Reactions.". http://www.lsa.umich.edu/psych/research%26labs/berridge/VideoIndex.htm.
- Kringelbach, Morten L.; Berridge, Kent C. (2010). Pleasures of the Brain. Oxford University Press. .
- Lopez, Shane J. (2011). The Encyclopedia of Positive Psychology. John Wiley & Sons. .
- Hothersall, D. 2004. "History of Psychology", 4th ed., Mcgraw-Hill:NY p. 290
- The Forty Principal Doctrines Archived 2016-02-12 at the Wayback Machine, Number III.
- Hedonism, 2004-04-20 Stanford Encyclopedia of Philosophy
- Bentham, Jeremy (1776). "A Fragment on Government". http://www.constitution.org/jb/frag_gov.htm.