Psychology courses introduce students to Maslow's "hierarchy of needs, " a pyramid diagram created by the American psychologist Abraham Maslow.

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Still, some psychologists quoted in the same issue of American Psychologist questioned how comparable this study is to Milgram's, given the differences in methods.

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The study, by Nansook Park and Christopher Peterson, used data collected through an online survey to identify whether personality traits were significantly different across cities and published their findings in the September issue of American Psychologist.

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In the 1970s Paul Ekman, an American psychologist, developed a comprehensive coding system which is still widely used.

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William Maddux, an American social psychologist at the INSEAD research center in France, studies how living abroad makes one more creative.

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It was brought to the U.S. and popularized by a student of his, American-taught psychologist Claudio Naranjo, in 1971.

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An American child psychologist, Alison Gopnik, when reaching for an analogy to illuminate the world as experienced by a baby, compared it to Paris as experienced for the first time by an adult American: a pageant of novelty, colour, excitement.

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The fear of flying constitutes one of the two most common fears humans grapple with (the other one being fear of public speaking), said Wilson, who served as lead psychologist for American Airlines' first national program for fear of flying.

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