In certain domains, people represent some of an individual's properties (e.g., a tiger's ferocity), but not others (e.g., a tiger's being in the zoo), as stemming from the assumed "essence" of the individual's category. How do children identify which properties of an individual are essentialized and which are not? Here, we examine…

We systematically compared beliefs about animal (e.g., "lion"), artifactual (e.g., "hammer"), and institutional (e.g., "police officer") categories, aiming to identify whether people draw different inferences about which categories are subjective and which are socially constituted. We conducted two studies with 270…

Emotion development research centrally concerns capacities to produce emotions and to think about them. We distinguish these enterprises and consider a novel account of how they might be related. On one recent account, the capacity to have emotions of various kinds comes by way of the acquisition of emotion concepts. This account relies on a…

In this article, we integrate two constructionist approaches--the theory of constructed emotion and rational constructivism--to introduce several novel hypotheses for understanding emotional development. We first discuss the hypothesis that emotion categories are abstract and conceptual, whose instances share a goal-based function in a particular…

Visual appearance is one of the main cues children rely on when categorizing novel objects. In 3 studies, testing 128 3-year-olds and 192 5-year-olds, we investigated how various kinds of information may differentially lead children to overlook visual appearance in their categorization decisions across domains. Participants saw novel animals or…

Items commonly belong to many categories. Cross-classification is the classification of a single item into more than one category. This research explored 2- to 6-year-old children's use of 2 different category systems for cross-classification: script (e.g., school-time items, birthday party items) and taxonomic (e.g., animals, clothes). The…

Discusses problems of general interest in developmental psychology that can be successfully studied in the domain of food; these include (1) development of food likes and dislikes; (2) establishment of the edible/inedible distinction; (3) disgust and contagion; (4) transgenerational communication of preferences; and (5) transition to food…

Five experiments tested the development of conceptual categories by familiarizing infants to objects in a category and presenting them with an object in a different category. Infants' responses indicated that infants at 7 to 11 months categorized animals, vehicles, and furniture; at 11 months, plants and kitchen utensils; and at 9 to 11 months,…

This study attempted to determine whether a shift from complementary to similarity concepts occurred in preschool children prior to the shift from concrete-similarity to abstract-similarity concepts and had been observed among elementary school children. (Author/SB)

Four-year-olds were reliably accurate about movement potentials for the categories of mammals, nonmammalian animals, statues of animals, wheeled vehicles, and multipart, rigid objects. The three-year-olds' scores were significantly above chance in all categories but animals. Analyses showed that children were concerned about the cause of movement…

Nine experiments examined 6- to 10-month-olds' formation of an abstract category representation for "between." Findings indicated that older, but not younger infants, could form an abstract category representation for "between" when performing in an object-variation version of the between categorization task. Six- to…

Four studies assessed whether children and adults saw categorization decisions as objective matters of fact or as invented conventions. Found that preschoolers treated basic-level animal and human-made artifact category decisions as objective, with kinds of animals treated as more objective than kinds of artifacts. Adults' judgments were similar…

Two experiments used the preferential looking task to assess early word comprehension in 12- to 24-month olds. Results indicated that when target stimuli were named, 12-month olds displayed an increase in target looking for typical--but not atypical--targets, whereas 18- and 24-month olds displayed increases for both. (Author/KB)

Describes connectionist model showing exclusivity asymmetries when categorizing visual stimuli, similar to pattern shown by infants. Examines asymmetries in terms of an associative learning mechanism, distributed internal representations, and statistics of feature distributions in the stimuli. Details test of model with infants, finding that…

Individual differences in children's conceptual strategies at 3 years of age were predicted by aspects of children's behavior and language at 13 and 24 months. Production of pointing gestures at 13 months and nouns and attributive adjectives at 24 months were positively associated with the use of a taxonomic matching strategy at 3 years of age.…