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| 1911 |
| | | Alfred Adler ends his association breaks with Sigmund Freud and forms his own school of psychology | |
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| 1912 |
| | | Carl Jung breaks with Freud and introduces the concept of the collective unconscious | |
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| 1915 |
| | | Typhoid-carrier Mary Mallon is detained in New York after leaving a trail of destruction | |
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| 1915 March |
| | | A typhus epidemic sweeps through Serbia, severely weakening the nation's armed forces | |
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| 1916 |
| | | New Zealand surgeon Harold Gillies sets up a plastic surgery unit at Aldershot, a British military base | |
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| 1918 August |
| | | A world-wide pandemic of influenza breaks out, and within the space of a year kills 30 million people | |
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| 1920 |
| | | New Zealand surgeon Harold Gillies publishes a pioneering text book, Plastic Surgery of the Face | |
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| 1921 |
| | | Alfred Adler, in Vienna, opens the first of many child-guidance clinics | |
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| 1922 |
| | | Canadian physiologists Frederick Banting and Charles Best isolate insulin from the pancreas for the treatment of diabetes | |
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| 1923 |
| | | Sigmund Freud proposes a new interpretation of the mind in his book The Ego and the Id | |
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