68419
It is suggested that , as a defense against intrapsychic conflict , schizophrenics divest thing-presentations of significance and come to treat word-presentations as actual things ( cf. mental functioning in Piaget 's preoperational stage of cognitive development ) .
 Piaget
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:
 Piaget