As shown by Gustave Le Bon in 1895, it can be passed by contagion, in a way similar to a physical condition.
Trotter's book, Instincts of the Herd in Peace and War forms the basis for the research of both Wilfred Bion and Ernest Jones who established what would be called group psychology.
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During the first half of the twentieth century Le Bon's writings were used by media researchers such as Hadley Cantril and Herbert Blumer to describe the reactions of subordinate groups to media.
Bon Jovi | Gustave Flaubert | Bon Iver | Jon Bon Jovi | Gustave Eiffel | Gustave Doré | Gustave Courbet | Bon Ton | Gustave Kerker | The Bon-Ton | Simon Le Bon | Le Bon Marché | La voix du bon Dieu | Gustave De Smet | Bon Air, Virginia | La voix du bon Dieu (song) | Gustave Caillebotte | Yasmin le Bon | Thu Bồn River | The Sims 2: Bon Voyage | Sylvie Le Bon-de Beauvoir | Quai Gustave-Ador | le Bon Marché | James Gustave Speth | It's My Life (Bon Jovi song) | Henri-Gustave Joly de Lotbinière | Henri-Gustave Delvigne | Gustave Reese | Gustave J. Stoeckel | Gustave Choquet |