Ready made opinions can be distributed day by day through the press, radio, and so on, again and again, till they reach the nerve cell and implant a fixed pattern in the brain. Consequently, guided public opinion is the result, according to Pavlovian theoreticians, of good propaganda technique, and the polls [are] a verification of the temporary successful action of the Pavlovian machinations on the mind.

Mental Seduction and Menticide: The Psychology of Thought Control and Brain-washing (ed. 1957)