Social categorization can be considered as a process of bringing together social objects or events in groups which are equivalent with regard to an individual's actions, intentions and system of beliefs.

Psychologists
Henri Tajfel
Polish-born British social psychologist (1919-1982) and a Holocaust survivor who lost most of his immediate family to the Nazis. The shock of returning to Poland after the war to find his world destroyed became the explicit origin of his research program on the cognitive sources of prejudice and intergroup relations. He spent the 1950s rebuilding his life through resettlement work for Jewish orphans, then studied psychology at Birkbeck before moving to Durham, Oxford, and from 1967 the Chair of Social Psychology at Bristol. The 1971 minimal-group experiments and the social identity theory developed with his student John Turner reshaped late-twentieth-century social psychology. He co-founded the European Association of Experimental Social Psychology. In 2018-19, sustained sexual harassment of female lab members was documented, prompting the EASP to rename its award.
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Henri Tajfel's Other Quotes
The mere awareness of the presence of an out-group is sufficient to provoke intergroup competitive or discriminatory responses on the part of the in-group.
Discrimination on the basis of categorization in terms of either Klee or Kandinsky is in itself sufficient to cause significant in-group preference.
Social identity is that part of an individual's self-concept which derives from his knowledge of his membership of a social group together with the value and emotional significance attached to that membership.
Too much of social psychology consists of experiments in a vacuum.
Related Quotes
Behavior as we shall observe it always seems to have the character of getting-to or getting-from a specific goal-object, or goal-situation.
-- Edward C. Tolman
Behavior is shaped largely by the exigencies of a given situation, and the notion that individuals act in consistent ways across different situations, reflecting the influence of underlying personality traits, is a myth.
-- Walter Mischel
Language is not a cultural artifact that we learn the way we learn to tell time or how the federal government works. Instead, it is a distinct piece of the biological makeup of our brains. Language is a complex, specialized skill, which develops in the child spontaneously, without conscious effort or formal instruction, is deployed without awareness of its underlying logic, is qualitatively the same in every individual, and is distinct from more general abilities to process information or behave intelligently.
-- Steven Pinker
Moral development continues throughout the life span, even spawning dialogue of philosophical implications of such research.
-- Lawrence Kohlberg
Right action tends to be defined in terms of general individual rights and standards which have been critically examined and agreed upon by the whole society.
-- Lawrence Kohlberg
When an axon of cell A is near enough to excite cell B and repeatedly or persistently takes part in firing it, some growth process or metabolic change takes place in one or both cells such that A's efficiency, as one of the cells firing B, is increased.
-- Donald O. Hebb