Given limitations in the integrative scope of past research, basic questions about the organization and development of preschoolers' living kinds concept remain open to debate. This study was designed to address past limitations through use of a longitudinal design, extensive stimulus set, and alternate indices of understanding. Thirty-five…

This study investigated preschoolers' living kinds conceptualization by employing an extensive stimulus set and alternate indices of understanding. Thirty-four 3- to 5-year-olds and 36 adult undergraduates completed 3 testing phases involving 4 object classes: plants, animals, mobile, and immobile artifacts. The phases involved inquiries…

Two studies (N = 456) compared the development of concepts of animal species and human gender, using a switched-at-birth reasoning task. Younger children (5- and 6-year-olds) treated animal species and human gender as equivalent; they made similar levels of category-based inferences and endorsed similar explanations for development in these 2…

J. Kagan (2008) urges contemporary developmentalists to (a) be cautious when attributing conceptual knowledge to infants based on looking-time performance, (b) constrain their interpretation of infant performance with multiple methodologies, and (c) reconsider the possibility that qualitative development may be the path by which perceptual infants…

Essentialism is the belief that certain characteristics (of individuals or categories) may be relatively stable, unchanging, likely to be present at birth, and biologically based. The current studies examined how different essentialist beliefs interrelate. For example, does thinking that a property is innate imply that the property cannot be…

A total of 12 three, four, five, seven, and nine year olds and 12 adult control subjects were asked 20 questions about two exemplars of each of 16 categories of animate beings and inanimate objects. Children's responses indicated that animism is not a pervasive phenomenon and does not appear to be the most primitive mode of conceptualization.…

Results of this replication study indicate considerable agreement with Piaget and Inhelder's description of stage-related verbal features while failing to confirm their description of stage-related nonverbal features. (JMB)

Three studies examined whether and when preschool children are willing to attribute internal and immanent causes to motion. Found that preschool children were more likely to attribute immanent cause to motion in animals than in artifacts and more likely to attribute human cause to motion in artifacts than in animals. (MDM)

Children aged three to six years were taught a specified route through an environment and were tested on their ability to: (1) travel the route in reverse, (2) name the sequence of landmarks along the reverse route, (3) infer the relationship between parts of the environment not directly traveled between, and (4) construct a model of the…

A longitudinal study of young children's conceptions of money and its value was conducted among 80 subjects between the ages of 3 and 8 years. The research was conducted within the framework of Piagetian theory using the "critical method." Results demonstrate that the development of the notions under investigation proceeds in six…

Examines the development of infants' ability to begin recognizing novel referents of common object names. In particular, the present experiment investigated the development of 12- to 20-month-old infants' ability to infer that an unfamiliar but categorically related object can be designated by a newly learned name for the object class. (Author/RH)

Examined whether children differentiate or confuse the domains of folk biology and folk psychology. Children and adult subjects were asked whether the animals depicted in pictures possessed certain biological and psychological properties. Results indicated that by kindergarten, notions of folk psychology and folk biology are sufficiently…

Children of the Baka, a preliterate society of Pygmies in southeast Cameroon, were tested for their conception of mind. Several studies conducted in other countries were reviewed. Results provide support for the claim that belief-desire reasoning is universally acquired in childhood. (GLR)

Two experiments tested two, three, and four year olds' ability to understand false beliefs. Results of both experiments support earlier claims that an understanding of false beliefs and deceptive ploys emerges at around age four. Two and three year olds can be led to produce such ploys but show no clear understanding of their effect. (GLR)

Examined the development of stable concepts of "boy" and "girl" in kindergarteners and first and second graders. Gender constance was explored in relation to: performance on conservation tasks; application of gender label to self or other; application of gender label to live person or pictorial representations; and sex role…