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In page Psychohistory:

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Psychohistorians have written much about changes in the human psyche through history; changes that they believe were produced by parents, and especially the mothers' increasing capacity to empathize with their children. Due to these changes in the course of history, different psychoclasses (or psychogenic modes) emerged. A psychoclass is a type of mentality that results from, and is associated with, a particular childrearing style, and in its turn influences the method of childrearing of the next generations. According to psychohistory theory, regardless of the changes in the environment, it is only when changes in childhood occur and new psychoclasses evolve that societies begin to progress.[citation needed]