this, Zajonc conducted an experiment where he studied two male white carneaux pigeons. The pigeons were trained to distinguish between two tones. They were required to peck the left key for loud noise and the right key for soft noise. Every correct response was awarded with food to the pigeons. After each trial, there was a blackout followed by a light which indicated start of another trial. Zajonc found that the sensory interaction hypothesis does hold true, the pigeons not only used the intensity of the tone but also used the presentation of light while making a response. Awards Zajonc was the winner of the 1975 AAAS Prize for Behavioral Science Research. Zajonc won the award for the Distinguished Scientific Contribution on September 2, 1979 at the meeting of the American Psychological Association. His Award address, published in American Psychologist as work on "Feeling and Thinking: Preferences Need No Inferences," was highly influential in re-focusing interest on affective processes in psychology. Further reading This is a partial bibliography of Zajonc's works in English. 1965. Social facilitation. Science, 149, 269–274. 1966. Social facilitation of dominant and subordinate responses. Journal of Experimental Social Psychology, 2(2), 160–168. 1968. Attitudinal effects of mere exposure. Journal of Personality and Social Psychology, 9(2, Pt. 2), 1–27. 1975. Birth Order and Intellectual Development, with G. Markus. Psychological Review, 82, 74–88. 1980. Feeling and thinking: Preferences need no inferences. American Psychologist, 35(2), 151–175. 1980. The Confluence Model: Parameter Estimation for Six Divergent Data Sets on Family Factors and Intelligence. INTELLIGENCE, 4, 349–361. 1982. Affective and cognitive-factors in preferences, with H. Markus. Journal of Consumer Research, 9(2), 123–131. 1983. Validating the Confluence Model. Psychological Bulletin, 93(3), 457–480. 1984. On the primacy of affect. American Psychologist, 39(2), 117–123. 1993. The confluence model: Differential or difference equation European Journal of Social Psychology, 23, 211–215. See also Audience effect ("in subjects ranging from cockroaches to humans") Facial feedback hypothesis References 1923 births Social psychologists 2008 deaths 20th-century American psychologists Deaths from pancreatic cancer Deaths from cancer in California University of Michigan alumni University of Michigan faculty Polish emigrants to the United States People from Łódź American people of Polish descent