I don’t see how people could claim that ‘mass-formation’ doesn’t exist or has never been scientifically studied. The term just refers – it goes without saying – to the process of the formation of a mass or a crowd. Mass formation has been studied for over 200 years, beginning with such scholars as Gustave Le Bon, Freud, McDougal, Canetti, Hannah Arendt, etc. In the twentieth century, psychologists such as Ash and Sheriff have studied mass formation experimentally.
Some of these scholars did explicitly use the term mass-formation, others didn’t. But what they studied was basically the same: the way in which individual’s mental states is influenced by their tendency to conform to group thinking. I myself have over 100 publications on Web of Science, a large part of them focusing on how individuals’ personality structures is influenced by their relationships with other people. Once you understand the basic mechanisms through which individual’s personality is in the grip of the opinion of other people, you understand the elementary mechanisms at work in this enormous psychological process that is happening when a mass emerges in a society.
In my upcoming book: The psychology of totalitarianism, I analyze and describe the way in which the psychological process of mass formation got stronger and stronger throughout the last two centuries and eventually leads to totalitarian thinking and in the end also to the emergence of totalitarian states.”