50360
In 1972 , Harold Puthoff and Russell Targ initiated a series of human subject studies to determine whether participants ( the " viewers " or " percipients " ) could reliably identify and accurately describe salient features of remote locations or " targets " .
 Harold Puthoff, Russell Targ
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:
 Harold Puthoff, Russell Targ