63097
Years afterward , upon reflection , he credited the faculty there with influencing the direction of his later work because of their emphasis on the " training of perception " , as well as such concepts as Richards ' notion of " feedforward " .
 Richards
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Richards