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View that entities have identifying attributes

Essentialism is the view that objects have a set of attributes that are necessary to their identity. In early Western thought, Platonic idealism held that all things have such an "essence"—an "idea" or "form". In Categories, Aristotle similarly proposed that all objects have a substance that, as George Lakoff put it, "make the thing what it is, and without which it would be not that kind of thing". The contrary view—non essentialism—denies the need to posit such an "essence". Essentialism has been controversial from its beginning. In the Parmenides dialogue, Plato depicts Socrates questioning the notion, suggesting that if we accept the idea that every beautiful thing or just action partakes of an essence to be beautiful or just, we must also accept the "existence of separate essences for hair, mud, and dirt". Older social theories were often conceptually essentialist. In biology and other natural sciences, essentialism provided the rationale for taxonomy at least until the time of Charles Darwin. The role and importance of essentialism in modern biology is still a matter of debate. Beliefs which posit that social identities such as race, ethnicity, nationality, or gender are essential characteristics have been central to many discriminatory or extremist ideologies. For instance, psychological essentialism is correlated with racial prejudice. Essentialist views about race have also been shown to diminish empathy when dealing with members of another racial group. In medical sciences, essentialism can lead to a reified view of identities, leading to fallacious conclusions and potentially unequal treatment.

Before evolution was developed as a scientific theory, there existed an essentialist view of biology that posited all species to be unchanging throughout time. The historian Mary P. Winsor has argued that biologists such as Louis Agassiz in the 19th century believed that taxa such as species and genus were fixed, reflecting the mind of the creator. Some religious opponents of evolution continue to maintain this view of biology. 21st century works by historians of systematic biology has cast doubt upon this view of pre Darwinian thinkers. Winsor, Ron Amundson and Staffan Müller Wille have each argued that in fact the usual suspects (such as Linnaeus and the Ideal Morphologists) were very far from being essentialists, and it appears that the so called "essentialism story" (or "myth") in biology is a result of conflating the views expressed by philosophers from Aristotle onwards through to John Stuart Mill and William Whewell in the immediately pre Darwinian period, using biological examples, with the use of terms in biology like species.

Cultural and racial essentialism is the view that fundamental biological or physical characteristics of human "races" produce personality, heritage, cognitive abilities, or 'natural talents' that are shared by all members of a racial group. In the early 20th century, many anthropologists taught this theory – that race was an entirely biological phenomenon and that this was core to a person's behavior and identity. This, coupled with a belief that linguistic, cultural, and social groups fundamentally existed along racial lines, formed the basis of what is now called scientific racism. After the Nazi eugenics program, along with the rise of anti colonial movements, racial essentialism lost widespread popularity. New studies of culture and the fledgling field of population genetics undermined the scientific standing of racial essentialism, leading race anthropologists to revise their conclusions about the sources of phenotypic variation. Historically, beliefs which posit that social identities such as ethnicity, nationality or gender determine a person's essential characteristics have in many cases been shown to have destructive or harmful results. It has been argued by some that essentialist thinking lies at the core of many simplistic, discriminatory or extremist ideologies. Psychological essentialism is also correlated with racial prejudice. In medical sciences, essentialism can lead to an over emphasis on the role of identities—for example assuming that differences in hypertension in African American populations are due to racial differences rather than social causes—leading to fallacious conclusions and potentially unequal treatment. Older social theories were often conceptually essentialist. Strategic essentialism, a major concept in postcolonial theory, was introduced in the 1980s by the Indian literary critic and theorist Gayatri Chakravorty Spivak. It refers to a political tactic in which minority groups, nationalities, or ethnic groups mobilize on the basis of shared gendered, cultural, or political identity. While strong differences may exist between members of these groups, and among themselves they engage in continuous debates, it is sometimes advantageous for them to temporarily "essentialize" themselves, despite it being based on erroneous logic, and to bring forward their group identity in a simplified way to achieve certain goals, such as equal rights or antiglobalization.

Essentialism in history as a field of study entails discerning and listing essential cultural characteristics of a particular nation or culture, in the belief that a people or culture can be understood in this way. Sometimes such essentialism leads to claims of a praiseworthy national or cultural identity, or to its opposite, the condemnation of a culture based on presumed essential characteristics. Herodotus, for example, claims that Egyptian culture is essentially feminized and possesses a "softness" which has made Egypt easy to conquer. To what extent Herodotus was an essentialist is a matter of debate; he is also credited with not essentializing the concept of the Athenian identity, or differences between the Greeks and the Persians that are the subject of his Histories. Essentialism had been operative in colonialism, as well as in critiques of colonialism. Post colonial theorists, such as Edward Said, insisted that essentialism was the "defining mode" of "Western" historiography and ethnography until the nineteenth century and even after, according to Touraj Atabaki, manifesting itself in the historiography of the Middle East and Central Asia as Eurocentrism, over generalization, and reductionism. Into the 21st century, most historians, social scientists, and humanists reject methodologies associated with essentialism, although some have argued that certain varieties of essentialism may be useful or even necessary. Karl Popper splits the ambiguous term realism into essentialism and realism. He uses essentialism whenever he means the opposite of nominalism, and realism only as opposed to idealism. Popper himself is a realist as opposed to an idealist, but a methodological nominalist as opposed to an essentialist. For example, statements like "a puppy is a young dog" should be read from right to left as an answer to "What shall we call a young dog", never from left to right as an answer to "What is a puppy?"

There is a difference between metaphysical essentialism and psychological essentialism, the latter referring not to an actual claim about the world but a claim about a way of representing entities in cognitions. Influential in this area is Susan Gelman, who has outlined many domains in which children and adults construe classes of entities, particularly biological entities, in essentialist terms—i. e., as if they had an immutable underlying essence which can be used to predict unobserved similarities between members of that class. This causal relationship is unidirectional; an observable feature of an entity does not define the underlying essence.

Essentialism has emerged as an important concept in psychology, particularly developmental psychology. In 1991, Kathryn Kremer and Susan Gelman studied the extent to which children from four–seven years old demonstrate essentialism. Children believed that underlying essences predicted observable behaviours. Children were able to describe living objects' behaviour as self perpetuated and non living objects' behavior as a result of an adult influencing the object. Understanding the underlying causal mechanism for behaviour suggests essentialist thinking. Younger children were unable to identify causal mechanisms of behaviour whereas older children were able to. This suggests that essentialism is rooted in cognitive development. It can be argued that there is a shift in the way that children represent entities, from not understanding the causal mechanism of the underlying essence to showing sufficient understanding. There are four key criteria that constitute essentialist thinking. The first facet is the aforementioned individual causal mechanisms. The second is innate potential: the assumption that an object will fulfill its predetermined course of development. According to this criterion, essences predict developments in entities that will occur throughout its lifespan. The third is immutability. Despite altering the superficial appearance of an object it does not remove its essence. Observable changes in features of an entity are not salient enough to alter its essential characteristics. The fourth is inductive potential. This suggests that entities may share common features but are essentially different; however similar two beings may be, their characteristics will be at most analogous, differing most importantly in essences. The implications of psychological essentialism are numerous. Prejudiced individuals have been found to endorse exceptionally essential ways of thinking, suggesting that essentialism may perpetuate exclusion among social groups. For example, essentialism of nationality has been linked to anti immigration attitudes. In multiple studies in India and the United States, it was showed that in lay view a person's nationality is considerably fixed at birth, even if that person is adopted and raised by a family of another nationality at day one and never told about their origin. This may be due to an over extension of an essential biological mode of thinking stemming from cognitive development. Paul Bloom of Yale University has stated that "one of the most exciting ideas in cognitive science is the theory that people have a default assumption that things, people and events have invisible essences that make them what they are. Experimental psychologists have argued that essentialism underlies our understanding of the physical and social worlds, and developmental and cross cultural psychologists have proposed that it is instinctive and universal. We are natural born essentialists." Scholars suggest that the categorical nature of essentialist thinking predicts the use of stereotypes and can be targeted in the application of stereotype prevention.