Cognition in children

Typicality judgments refer to the extent to which items are thought to be typical of their language categories. For example, an apple is a typical fruit, whereas a kiwi is an atypical one. Typicality judgments help reveal a person's level of word knowledge and concept development. The theory of category prototypes (Posner, 1969) gave rise to the assessment of the typicality judgments of children and adults. The two main purposes of this study were to provide typicality norms for learning disabled (LD) children, and to clarify the nature of the differences between learning disabled and nondisabled (NLD) students regarding their word knowledge and categorization skills. A total of 210 subjects participated in the study; 180 were public school children (grades 2, 4, 6) from Palm Beach County, Florida. Half of these students attended part-time classes for the learning disabled while the other half were enrolled in regular classrooms. All children had achieved IQs in the average range of intelligence. The remainder of the subjects (30) were adult college students at Florida Atlantic University in Boca Raton. All subjects were asked to determine whether each of 125 words were category members, and if they were, how well each one exemplified the particular category in question. Categories included birds, clothing, vegetables, fruit, and four-footed animals. Results revealed that the LD children knew the meanings of fewer category items, included fewer appropriate words as category items, and were less adultlike in their rankings of words that were included as category members. Although both LD and NLD children's word rankings became more adultlike with age, the LD children's pattern of progression differed. For LD children, typicality ratings became significantly more adultlike between grades four and six, whereas the NLD subjects demonstrated significantly improved ratings between grades two and four. This different pattern illustrated a developmental lag in word knowledge for the LD children.

Studies have shown that human infants can integrate the multisensory attributes of their world and, thus, have coherent perceptual experiences. Multisensory attributes can either specify non-arbitrary (e.g., amodal stimulus/event properties and typical relations) or arbitrary properties (e.g., visuospatial height and pitch). The goal of the current study was to expand on Walker et al.'s (2010) finding that 4-month-old infants looked longer at rising/falling objects when accompanied by rising/falling pitch than when accompanied by falling/rising pitch. We did so by conducting two experiments. In Experiment 1, our procedure matched Walker et al.'s (2010) single screen presentation while in Experiment 2 we used a multisensory paired-preference procedure. Additionally, we examined infants' responsiveness to these synesthetic-like events at multiple ages throughout development (four, six, and 12 months of age). ... In sum, our findings indicate that the ability to match changing visuospatial height with rising/falling pitch does not emerge until the end of the first year of life and throw into doubt Walker et al.'s (2010) claim that 4-month-old infants perceive audiovisual synesthetic relations in a manner similar to adults.

Although some research has suggested that very young children are "immune" to functional fixedness (FF), other work has shown that young children form robust associations between objects and their prescribed functions. Across two studies, I investigated (a) the developmental trajectory of FF and (b) its relationship with executive function components (inhibitory control and working memory) in 3- to 6-year old children. Both older and younger children experience FF, but older children use familiar tools more flexibly than younger children (3- and 4-year olds). Furthermore, inhibitory control was related to overcoming FF, indicating that it may be an important cognitive capacity for creative problem-solving. Finally, in a third study, children were instructed to use mental imagery to help them solve the functional fixedness problems. However, these instructions were ineffective at reducing FF compared to a control condition, underscoring the robust nature of object-function relationships in early childhood.

Problem solving and strategy adaptation was assessed in 47 children ranging from 36 to 67 months. This was evaluated through problem sets in which participants were given tools that failed to reach given goal states, and then instructed to select appropriate tools in order to reach desired results. Analyses revealed that when participants were given a choice of tools to solve a given problem, they were more likely to select a correct tool when options were similar in function and appearance. Additionally, participants were more likely to verbalize the need for a new tool when there was a lack of novel tool choices. However, the presence of a novel tool choice was linked to longer problem solving time. Findings are congruent with literature that suggests children possess the ability to select tools based on functional, not superficial, qualities, and can be easily distracted by the presence of novel stimuli.

This study explored the effects of Problem-Based Leaning (PBL) with webanchored instruction in nanotechnology on the science conceptual understanding, the attitude towards science, and the perception of science in society of elementary students. A mixed-methods approach was used. Subjects (N=46) participated in the study for approximately two and a half weeks. A pretest was administered for science conceptual understanding and for attitude towards science. An intervention, web-based nanotechnology anchor, Catching the Rays, followed. Catching the Rays navigated subjects through a nano quest on sunscreen. After the intervention, a posttest was administered for each science conceptual understanding and attitude towards science. Following, a purposeful selection of interviewees (N=6) participated in a Nano Post- Interview. Pretest/posttest data were analyzed using a paired t test. Results of the paired t test for science conceptual understanding (post- being larger than pre-, p <. 01) and attitude towards science (post- being larger than pre-, p < .01) were significant at the p < .05 alpha level. Nano Post-Interview data were coded and analyzed independently by two raters for emerging themes. Two themes of "Risks and Benefits" and "Solves Problems" emerged from subjects' (N=6) responses to perception of science in society questions. The theme of "Risks and Benefits" strongly suggests that subjects have a positive perception that nanotechnology comes with risks and benefits to society. The theme of "Solves Problems" strongly suggests subjects have a positive perception that nanotechnology is governed by society's needs and is used to help solve society's problems. Findings from this study suggest that PBL with web-anchored instruction in nanotechnology had a positive effect on subjects' science conceptual understanding, attitude towards science, and perception of science in society.

One of the most fundamental functions of human cognition is to parse an otherwise chaotic world into different kinds of things. The ability to learn what objects are and how to respond to them appropriately is essential for daily living. The literature has presented contrasting evidence about the role of perpetual features such as artifact appearance versus causal or inductive reasoning in chldren's category distinctions (e.g., function). The present project used a child-initiated inquiry paradigm to investigate how children conceptualize artifacts, specifically how they prioritize different types of information that typify not only novel but also familiar objects. Results underscore a hybrid model in which perceptual features and deeper properties act synergistically to inform children's artifact conceptualization. Function, however, appears to be the driving force of this relationship.

This qualitative study examined the nature of 5th-grade students' oral and written discourse in relation to their conceptual learning during six science inquiry-based lessons. Qualitative data were collected using small group observations, transcriptions of small group discourse, students' science notebooks, and student interviews. These data were used to create an in-depth illustration of 5th-grade students' discourse and the impact of that discourse on their science conceptual learning. Findings indicated students spoke in three main discourse classifications during small group inquiries and two of these discourses were also present in the science notebook entries. Findings further indicated gender did not impact the nature of students' oral or written discourse regarding their conceptual learning. Implications for classroom practice and suggestions for further research in elementary science education are offered.

Growth is a property that is unique to living things. Studies demonstrate that even preschool children use growth to determine whether objects are alive. However, little identifies explanations that children use to attribute growth. The goal of the present study was to investigate how people reason about growth. We hypothesized that older children would outperform younger children in understanding that growth is inevitable for living things, while adults would consistently perform at ceiling levels. Our hypothesis was partially supported. Although adults consistently outperformed children, older children rarely outperformed younger children. Still, both younger and older children performed above chance in attributing growth. Moreover, all participants were more likely to use biological explanations to explain growth. Taken together, this research qualifies the early hypotheses of Piaget (1929) and Carey (1985) that children lack a well developed biological domain before age nine, but suggests that a biological domain, though less developed, is present. Based on these findings, implications for more efficient approaches to science education are discussed.

Prospective memory is remembering to perform an action in the future, such as attending a meeting (a time-based task) or picking up milk at the gas station (an eventbased task), and is crucial to achieving goal-directed activities in everyday life. Children who fail to develop prospective memory abilities are likely to experience difficulties interacting with parents, teachers, and peers. To date, research on prospective memory development has been primarily descriptive or focused on underlying executive functioning. This dissertation investigated the developmental relationship between metacognitive representation and prospective memory in preschool and elementary school children and adults. Findings from Study 1 indicated that individual differences in representational ability independently predicted individual differences in 3-year-olds' performance on event-based tasks that are of low-interest. Qualitative changes are important to consider when modeling prospective memory develop ment, as with episodic memory. Study 2 presents findings based on a study using the CyberCruiser 2.0, an Xbox-style racing game designed to assess time-based prospective memory. This study confirmed that kindergarten children are capable of completing this time-based prospective memory task but revealed that performance improved with age. Between kindergarten and 2nd grade, children become better aware of their own mental processes and abilities, allowing them to adjust their strategies and perform more comparable to adults. As a result, in this study, younger children tended to overestimate their prospective memory abilities and were less likely to monitor passing time, causing them to fail more time-based task trials than older children and adults.

Parents' and children's behaviors are intricately woven together over the course of development. Consequently it is difficulty to determine the sources of influence predicting socially and academically oriented outcomes. Research from several developmental fields suggests that developing mechanisms of attention during the preschool years is crucial for both emotional and cognitive control. The current study shows that parental responsive behavior is important in understanding the development of voluntary attention. More specifically, the results suggest that parental awareness, assessed utilizing their perceptions of attentive temperament is an important factor in predicting their own behavior and the developmental outcomes of their children.