Recent Issues. Chapter 12: The Behavior of Organisms at Fifty. Quote 16

“The light could have been called a cue or clue, of course, and cognitive psychologists, if there had been any, might have said that it conveyed information about when to press the lever. It was simpler, however, to say only that an operant was stronger in the presence of any stimulus in the presence of which it had been reinforced.” (pp. 127-128)