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The category was described as more specific and limited than the existing concepts of " constitutional psychopathic state " or " psychopathic personality " which had had a very broad meaning ; the narrower definition was in line with criteria advanced by Hervey M. Cleckley from 1941 , while the term sociopathic had been advanced by George Partridge in 1928 when studying the early environmental influence on psychopaths .
 Hervey M. Cleckley, George Partridge
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:
 Hervey M. Cleckley, George Partridge