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Although pure idealism , such as that of George Berkeley , is uncommon in contemporary Western philosophy , a more sophisticated variant called panpsychism , according to which mental experience and properties may be at the foundation of physical experience and properties , has been espoused by some philosophers such as Alfred North Whitehead and David Ray Griffin .
 George Berkeley, Alfred North Whitehead, David Ray Griffin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 George Berkeley, Alfred North Whitehead, David Ray Griffin