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Since that early time , however , other researchers ( e.g. , Raymond Cattell , J. P. Guilford , and Louis Leon Thurstone ) have argued that intellect cannot be expressed in such a unitary manner , and have suggested more multifaceted approaches to intelligence .
 Raymond Cattell, J. P. Guilford, Louis Leon Thurstone
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:
 Raymond Cattell, J. P. Guilford, Louis Leon Thurstone