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In philosophy of mind , mind–body dualism is the doctrine that mental activities exist apart from the physical body , notably posited by René Descartes in " Meditations on First Philosophy " .
 René Descartes
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 René Descartes