Susan Gelman

Essentialism is the idea that certain categories, such as "dog," "man," or "intelligence," have an underlying reality or true nature that gives objects their identity. Where does this idea come from? In this book, Susan Gelman argues that essentialism is an early cognitive bias. Young children's concepts reflect a deep commitment to essentialism, and this commitment leads children to look beyond the obvious in many converging ways: when learning words, generalizing knowledge to new category members, reasoning about the insides of things, contemplating the role of nature versus nurture, and constructing causal explanations. Gelman argues against the standard view of children as concrete or focused on the obvious, instead claiming that children have an early, powerful tendency to search for hidden, non-obvious features of things. She also attacks claims that children build up their knowledge of the world based on simple, associative learning strategies, arguing that children's concepts are embedded in rich folk theories. Parents don't explicitly teach children to essentialize; instead, during the preschool years, children spontaneously construct concepts and beliefs that reflect an essentialist bias.Essentialist accounts have been offered, in one form or another, for thousands of years, extending back at least to Aristotle and Plato. Yet this book is the first to address the issues surrounding essentialism from a psychological perspective. Gelman synthesizes over 15 years of empirical research on essentialism into a unified framework and explores the broader lessons that the research imparts concerning, among other things, human concepts, children's thinking, and the ways in which language influences thought. This volume will appeal to developmental, cognitive, and social psychologists, as well as to scholars in cognitive science and philosophy.

Authentic objects are those that have a historical link to a person, event, time, or place of some significance. The current study examines everyday beliefs about authentic objects, with three primary goals: to determine the scope of adults' evaluation of authentic objects, to examine such evaluation in two distinct cultural settings, and to determine whether a person's attachment history predicts evaluation of authentic objects. We found that college students in the UK and the USA consistently evaluate a broad range of authentic items as more valuable than matched control objects, more desirable to keep, and more desirable to touch, though only non-personal authentic items were judged to be more appropriate for display in a museum. These patterns were remarkably similar across the two cultural contexts. Additionally, those who had an attachment object as a child evaluated objects more favorably, and in particular judged authentic objects to be more valuable. Altogether, these results demonstrate broad endorsement of "positive contagion" among college-educated adults.

This set of seven experiments examines reasoning about the inheritance and acquisition of physical properties in preschoolers, undergraduates, and biology experts. Participants (N = 390) received adoption vignettes in which a baby animal was born to one parent but raised by a biologically unrelated parent, and they judged whether the offspring would have the same property as the birth or rearing parent. For each vignette, the animal parents had contrasting values on a physical property dimension (e.g., the birth parent had a short tail; the rearing parent had a long tail). Depending on the condition, the distinct properties had distinct functions (“function-predictive”) were associated with distinct habitats (“habitat-predictive”), or had no implications (“non-predictive”). Undergraduates' bias to view properties as inherited from the birth parent was reduced in the function- and habitat-predictive conditions. This result indicates a purpose-based view of inheritance, whereby animals can acquire properties that serve a purpose in their environment. This stance was not found in experts or preschoolers. We discuss the results in terms of how undergraduates' purpose-based inheritance reasoning develops and relates to larger-scale misconceptions about Darwinian evolutionary processes, and implications for biology education

Three studies examined the co-existence of natural and supernatural explanations for illness and disease transmission, from a developmental perspective. The participants (5-, 7-, 11-, and 15-year-olds and adults; N = 366) were drawn from 2 Sesotho-speaking South African communities, where Western biomedical and traditional healing frameworks were both available. Results indicated that, although biological explanations for illness were endorsed at high levels, witchcraft was also often endorsed. More important, bewitchment explanations were neither the result of ignorance nor replaced by biological explanations. Instead, both natural and supernatural explanations were used to explain the same phenomena, and bewitchment explanations were highest among adults. Taken together, these data provide insight into how diverse, culturally constructed belief systems about illness co-exist across development.

The learning style myth is a commonly held myth that matching instruction to a student's “learning style” will result in improved learning, while providing mismatched instruction will result in suboptimal learning. The present study used a short online reasoning exercise about the efficacy of multimodal instruction to investigate the nature of learning styles beliefs. We aimed to: understand how learning style beliefs interact with beliefs about multimodal learning; characterize the potential complexity of learning style beliefs and understand how this short exercise might influence endorsements of learning styles. Many participants who believed in the learning style myth supported the efficacy of multimodal learning, and many were willing to revise their belief in the myth after the exercise. Personal experiences and worldviews were commonly cited as reasons for maintaining beliefs in learning styles. Findings reveal the complexity of learning style beliefs, and how they interact with evidence in previously undocumented ways.

For adults, ownership is a concept that rests on principles and connections that apply broadly – whether the owner is the self or someone else, and whether the self is giver or receiver. The present studies tested whether preschool children likewise treat ownership in this abstract fashion. In Experiment 1, 20 children and 24 adults were assigned to be either “givers” or “receivers.” They were then asked to identify which items they and the researcher owned. In Experiment 2, 20 children and 24 adults were asked which items they and the experimenter liked best. In both experiments, participants’ judgments were not influenced by their role, but were more adult-like when reasoning about self-owned than other-owned objects. These data suggest that intuitions about property ownership are initially egocentric – biased toward linking objects to one’s self – and then extend to others over the course of development.

Forty-one Indian and American preschoolers, 48 first graders, 41 third graders, 43 fifth graders, and 48 college students were presented with vignettes that described symptoms of illnesses. Participants in both countries were presented with a biological, moral, psychological, and irrelevant choice for each of the illnesses. Results indicated that across all ages in both countries, the biological model was the most prominent. However, with increasing age Indian participants acknowledged significantly more moral and psychological causes than Americans. Participants' justifications revealed that Americans made explicit reference to germs whereas Indians primarily referred to contamination. This indicates that although the cultural backdrops between the two sets of populations are very different, there is a complex interaction of similarities and differences.

Linguistic form and conceptual level both play a role in the structure of adult lexical hierarchies. The present studies examined how these factors might affect acquisition. In their linguistic form, labels can be single nouns or compound nouns. In conceptual level, categories can be structured at the basic, superordinate, or subordinate levels. Both of these factors were varied in two experiments, in which 133 children, aged 2;11 to 5;11, were taught novel lexical hierarchies. As predicted, compound nouns were easier to learn than single nouns, especially at the subordinate level. Age of child and category level influenced the kinds of errors children made. The most common error was to treat hierarchically related words as labeling mutually exclusive subsets, so that terms from different levels contrasted at the same level. Both factors--linguistic form and conceptual level--influenced children's learning of new lexical hierarchies.

Previous research shows that Multiracial adults are categorized as more Black than White, especially when they have angry facial expressions. The present research examined the extent to which these categorization patterns extended to Multiracial children, with both White and Black participants. Consistent with past research, both White and Black participants categorized Multiracial children as more Black than White. Counter to what was found with Multiracial adults in previous research, emotional expressions did not moderate how Multiracial children were categorized. Additionally, for Black participants, anti-White bias was correlated with categorizing Multiracial children as more White than Black. The developmental and cultural implications of these data are discussed, as they provide new insight into the important role that age plays in Multiracial person perception.