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| 1961 || || {{w|Ambiguity effect}} is first described by {{w|Daniel Ellsberg}}.<ref>{{cite book|last1=Borcherding|first1=Katrin|last2=Laričev|first2=Oleg Ivanovič|last3=Messick|first3=David M.|title=Contemporary Issues in Decision Making|url=https://books.google.com/books?id=W3l9AAAAMAAJ|year=1990|publisher=North-Holland|isbn=978-0-444-88618-7|page=50}}</ref>
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| 1967 || || "Chapman (1967) described a bias in the judgment of the frequency with which two events co-occur. This demonstration showed that the [[co-occurrence]] of paired stimuli resulted in participants overestimating the frequency of the pairings." ""{{w|Illusory correlation}}" was originally coined by Chapman and Chapman (1967) to describe people's tendencies to overestimate relationships between two groups when distinctive and unusual information is presented.<ref name="Chapman1967">{{cite journal|last1=Chapman|first1=L|title=Illusory correlation in observational report|journal=Journal of Verbal Learning and Verbal Behavior|volume=6|issue=1|year=1967|pages=151–155|doi=10.1016/S0022-5371(67)80066-5}}</ref>"<ref>{{cite journal|last=Chapman|first=L.J|title=Illusory correlation in observational report|journal=Journal of Verbal Learning|year=1967|volume=6|pages=151–155|doi=10.1016/s0022-5371(67)80066-5}}</ref>
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| 1968 || || The {{w|conservatism (belief revision)}} bias is discussed by {{w|Ward Edwards}}.<ref name="edwards1">Edwards, Ward. "Conservatism in Human Information Processing (excerpted)". In Daniel Kahneman, Paul Slovic and Amos Tversky. (1982). ''Judgment under uncertainty: Heuristics and biases''. New York: Cambridge University Press. {{ISBN|978-0521284141}} Original work published 1968.</ref>
