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| 1920 || || "First coined back in 1920, the halo effect describes how our impression of a person forms a halo around our conception of their character." "The term was coined by psychologist Edwin Thorndike in 1920."<ref>{{cite web |title=This Cognitive Bias Explains Why Pretty People Make 12% More Money Than Everybody Else |url=https://www.businessinsider.com.au/halo-effect-money-beauty-bias-2014-11 |website=businessinsider.com |accessdate=6 April 2020}}</ref><ref>{{cite web |title=What Is the Halo Effect? |url=https://www.psychologytoday.com/us/basics/the-halo-effect |website=psychologytoday.com |accessdate=6 April 2020}}</ref>
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| 1922 || || The term “stereotype” is first used in the modern psychological sense by American journalist Walter Lippmann in his work ''Public Opinion''.<ref name="Stereotypes Defined"/>
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| 1927 || || Russian psychologist {{w|Bluma Zeigarnik}} publishes in the journal ''[[Psychological Research|Psychologische Forschung]]'' a report on a series of experiments uncovering the processes underlying the phenomenon later called {{w|Zeigarnik effect}}.<ref>Zeigarnik 1927: "Das Behalten erledigter und unerledigter Handlungen". ''[[Psychologische Forschung]]'' 9, 1-85.</ref>
