Two experiments used error-detection to determine the reason for 3-year olds' perseverative errors on the postswitch phase of the Dimensional Change Card Sort. Results implied that perseveration cannot be attributed to difficulty inhibiting prepotent motor responses, but that changes in rule use between 3 and 5 years are more likely to increase…

Three experiments assessed the claim that preschoolers override form class cues in the interest of honoring word- meaning assumptions when acquiring new labels. Results demonstrated that children respected the form class cues when these cues and word-meaning assumptions suggested conflicting interpretations. It was suggested that past findings…

Investigated whether Brazilian 4-year-olds held essentialist beliefs about animal categories. Found that middle class and poor children were equally likely to interpret labels as referring to mutually exclusive animal categories, and more likely to accept a common label for animals sharing internal properties than superficial properties,…

Children 3.5 to 5 years old were asked to judge which of several possible sets of parts matched a configured target form and to copy the target forms. Found a significant association between age and performance on the perception task and consistency across the two tasks. (MDM)

Two studies examined whether object names and functions act as cues to categories for infants. Findings indicated that both 14- and 18-month-olds were more likely to select the category match after being shown a novel category exemplar with its function than when given no additional cues. Only at 18 months did naming the objects enhance…

Three experiments tested 3- and 4-year-olds' use of abstract principles to classify and label objects by shape or function. Findings indicated that 4-year-olds readily adopted either rule when instructed to match objects by shape or function, but 3-year-olds followed only the shape rule. Without a rule, 4-year-olds tended to match by shape unless…

Two experiments examined preschoolers' ability to apply multiple labels to representational objects and to people. Found that preschoolers reliably produced or accepted several words per entity and accepted a high percentage of class-inclusive and overlapping word pairs. The mean number of words produced in labeling task was related to receptive…

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…

Preschoolers viewed stimulus sets comprised of a sample picture and three types of matches and were asked to choose a match that "went with" each sample. Children's choices indicated that a shift occurs between 3 and 4 years of age from a taxonomic bias to a thematic bias. Animate sample stimuli enhanced children's tendency to adopt…

Examines a model for children's strategies for inclusion tasks. Suggests that young children are not consistent in task strategies and that they display mixed response strategies. Strategies may change with development. (ET)

Examined the role of the psychological process of comparison in young children's ability to extend a novel adjective to other objects sharing a salient property whether objects are of the same or different basic-level categories. Found that comparison operates in conjunction with naming to support extension of novel adjectives to properties of…

Examined in six experiments toddlers' use of syntactic cues to learn proper names and count nouns. Found that by 24 months, both girls and boys were significantly more likely to select a labeled object if they had heard a proper name than if they had heard a count noun. At 20 months, neither girls nor boys demonstrated this effect. (Author/KB)

Four studies examined developmental differences in the representation of basic-subordinate inclusion relationships in three-, five-, and seven-year olds and undergraduates. Found that even three-year olds showed rudimentary knowledge of the asymmetry of inclusion. There was a marked developmental gap between producing subordinate category names…

Experiment 1 suggested that age differences in line-drawing interpretation among subjects between 6 and 24 years reflected changes in short-term memory for features and changes in strategies used to integrate features over space and time. Experiment 2 suggested that older observers were more active in their attempts to interpret drawings and that…