Age-related changes in representational flexibility are a characteristic feature of declarative memory development. The authors suggest that a qualitative shift in the nature of infants' memory representations accounts for increasing memory flexibility with age. We will argue that a comprehensive theory of declarative memory development must (1)…

According to a recent account of infants' acquisition of their physical knowledge, the incremental-knowledge account, infants form distinct event categories, such as occlusion, containment, support, and collision events. In each category, infants identify one or more vectors which correspond to distinct problems that must be solved. For each…

The purposes of this research were to examine the developmental relation between reality monitoring and episodic memory, to link reality monitoring to autobiographical memory by using extended naturalistic events, and to examine prefrontal functioning as a potential contributor to development in reality monitoring and episodic memory. In…

Research on children's understanding of video has shown seeming contradictions. Fourteen-month-olds imitate actions seen on TV (Meltzoff, 1988) and 18-month-olds are reminded of an event by watching video (Sheffield & Hudson, 2003) but 24-month-olds fail at a video-mediated object-retrieval task requiring dual representational understanding…

Many recent studies have explored young children's ability to use information from physical representations of space to guide search within the real world. In one commonly used procedure, children are asked to find a hidden toy in a room after observing a smaller toy being hidden in the analogous location in a scale model of the room.…

Toddlers' symbolic understanding of iconic models was assessed through 2 comprehension-based tasks: 1 based on looking and 1 requiring manual selection of the target object. Toddlers received either iconic models or photographs of models as the symbolic referent. Overall, 18-month-olds performed poorly, and both 22- and 26-month-olds performed…

This paper estimates models of the evolution of cognitive and noncognitive skills and explores the role of family environments in shaping these skills at different stages of the life cycle of the child. Central to this analysis is identification of the technology of skill formation. We estimate a dynamic factor model to solve the problem of…

The study reported here investigates the role of pre-school education as a protective factor in the development of children who are at risk due to environmental and individual factors. This investigation builds upon earlier research by examining different kinds of "quality" in early education and tests the hypothesis that pre-schools of…

To identify the role of the child's own action in the development of the ability to coordinate perspectives, a spatial localization task was presented to 2 groups of children: 16 children between 18 and 24 months old, and 16 children between 42 and 48 months old. A reward was hidden randomly in one of two identical left-right locations on a…

To assess young children's understanding of false belief, investigators often show them a familiar container, then demonstrate that it holds an object different from the one the children expected. The children are then asked what they originally thought the container held, and what another container will hold. Three-year-old children typically…

Two experiments tested Hasher and Zacks' (1984) age-invariance hypothesis of frequency memory, which proposed that frequency memory is fully developed when a minimal level of physiological maturation is reached (by two or three years of age). Participating in the first experiment were 24 subjects at each of three ages: 8 years, 11 years, and young…

This paper proposes an explanation for the onset of autobiographical memory at about 4 years of age. It seems likely that normal middle-class 3-year-olds have not yet mastered language as a representational system. Research suggests that children learn the social and cultural forms of narrative memory in talk with others. It is hypothesized that…

Discusses two experiments in which middle-aged, elderly, professional, and non-professional males and females were given the Conceptual Styles Test. An analysis of variance on the percentage of complementary responses revealed significant effects for age, occupation, and th interaction between age and sex. (ED)

A series of studies focused on (1) the evolution of the notion of identity of objects among infants up to 15 months of age and (2) the changing rules by which this development may be understood. Six identity tasks were presented to 60 infants divided into five age groups: 5, 7, 9, 12, and 15 months. Two objects were used in all tasks. In the first…

An experiment was conducted to test the hypothesis (derived from Piaget's theory of cognitive development) that the structure of children's drawings and play-constructions, being expressions of the same underlying function, should be similar. Two groups of 4- and 6-year-old nursery school children were given a testing task consisting of an orally…