Tanya Kaefer

Pre-existing Background Knowledge Influences Socioeconomic Differences in Preschoolers’ Word Learning and Comprehension

The goal of the current study is to explore the influence of knowledge on socioeconomic discrepancies in word learning and comprehension. After establishing socioeconomic differences in background knowledge (Study 1), the authors presented children with a storybook that incorporates this knowledge (Study 2). Results indicated that middle-income children learned significantly more words and comprehended the story better than lower-income children. By contrast, Study 3 presented children with a novel category and found that children performed equally in their word learning and comprehension. This suggests that socioeconomic differences in vocabulary and comprehension skills may be partially explained by differences in extant knowledge.

Taxonomies Support Preschoolers’ Knowledge Acquisition from Storybooks

For young children, storybooks may serve as especially valuable sources of new knowledge. While most research focuses on how extratextual comments influence knowledge acquisition, we propose that children’s learning may also be supported by the specific features of storybooks. More specifically, we propose that texts that invoke children’s knowledge of familiar taxonomic categories may support learning by providing a conceptual framework through which prior knowledge and new knowledge can be readily integrated. In this study, 60 5-year olds were read a storybook that either invoked their knowledge of a familiar taxonomic category (taxonomic storybook) or focused on a common thematic grouping (traditional storybook). Following the book-reading, children’s vocabulary acquisition, literal comprehension, and inferential comprehension were assessed. Children who were read the taxonomic storybook demonstrated greater acquisition of target vocabulary and comprehension of factual content than children who were read the traditional storybook. Inferential comprehension, however, did not differ across the two conditions. We argue for the importance of careful consideration of book features and storybook selection in order to provide children with every opportunity to gain the knowledge foundational for successful literacy development.

Improving Low-Income Preschoolers’ Word and World Knowledge: The Effects of Content-Rich Instruction

This study examined the efficacy of a shared book-reading approach to integrating literacy and science instruction. The purpose was to determine whether teaching science vocabulary using information text could improve low-income preschoolers’ word knowledge, conceptual development, and content knowledge in the life sciences. Teachers in 17 preschool classrooms and 268 children participated; nine classrooms were assigned to treatment, eight to control. The treatment group received a science-focused shared book-reading intervention, 4 days a week, 12–15 minutes daily for 12 weeks, while the control group continued with business as usual. Results indicated statistically and practically significant effects on children’s word, concepts, and content knowledge and knowledge of the information text genre compared to the control group. However, we recognize the potential confound of district with treatment condition as a major limitation of the study.

A Bidirectional Relationship between Conceptual Organization and Word Learning

This study explores the relationship between word learning and conceptual organization for preschool-aged children. We proposed a bidirectional model in which increases in word learning lead to increases in taxonomic organization, which, in turn, leads to further increases in word learning. In order to examine this model, we recruited 104 4-year olds from Head Start classrooms; 52 children participated in a two-week training program, and 52 children were in a control group. Results indicated that children in the training program learned more words and were more likely to sort taxonomically than children in the control condition. Furthermore, the number of words learned over the training period predicted the extent to which children categorized taxonomically. Additionally, this ability to categorize taxonomically predicted the number of words learned outside the training program, over and above the number of words learned in the program. These results suggest a bi-directional relationship between conceptual organization and word learning.

A Double Dose of Disadvantage: Language Experiences for Low-Income Children in Home and School.

There is a virtual consensus regarding the types of language processes, interactions, and material supports that are central for young children to become proficient readers and writers (Shanahan et al., 2008). In this study, we examine these supports in both home and school contexts during children’s critical transitional kindergarten year. Participants were 70 children living in 2 different communities: neighborhoods of concentrated poverty (i.e., poverty rates over 40%) and borderline neighborhoods (i.e., poverty rates of 20–40%). From an ecological perspective, our goal was to examine the quantity and quality of knowledge-building supports in these contexts, and their relationship to children’s school readiness outcomes. Interactive parent-child tasks were designed to elicit child-directed language in the home, while naturalistic observations in the kindergarten classrooms captured teachers’ child-directed language. Children living in concentrated poverty were more likely to experience language of more limited complexity and diversity in both home and kindergarten contexts as compared to children living in borderline communities. We argue that the “double dose of disadvantage” in the language supports children receive at home and at school may affect their school readiness in significant, yet distinct, ways.

Does Mother Know Best? Maternal Knowledge Calibration Predicts Children’s Oral Language Development

For young children, maternal testimony is an important source of knowledge. Research suggests that children privilege assertions expressed with certainty; however, adults frequently overestimate their knowledge, which may lead them to express certainty about incorrect information. This study addressed three questions. (1) To what extent do mothers convey domain knowledge when talking to their kindergartners? (2) Do mothers successfully calibrate their knowledge during these conversations? (3) Does mothers’ knowledge calibration predict their children’s language outcomes? Forty-nine mother-child dyads read a picture book about a familiar domain. Mothers’ assertions of domain knowledge were coded for accuracy and expressed certainty. Results revealed that mothers tended to overestimate their knowledge. Knowledge calibration accuracy positively predicted child outcomes. Successful calibration was associated with stronger vocabulary knowledge and listening comprehension, whereas poor knowledge calibration was associated with weaker child outcomes. Knowledge calibration may be a crucial factor in the successful transmission of knowledge during mother-child conversations and impact children’s language development.

Integrating Orthographic and Phonological Knowledge in Early Readers: Implicit and Explicit Knowledge

Children develop some orthographic knowledge before learning to read. In some contexts phonological knowledge can scaffold orthographic understanding, but in others, phonological knowledge must be ignored in favor of orthographic knowledge. The current study examines the development of orthographic knowledge as it interacts with phonological knowledge in early readers. Forty-five Kindergarten students were presented with two different nonwords on screen and their gaze was tracked. In the first task, they were asked to choose the best “word,” and in the second task they were asked to choose the best “word” for a specific pronunciation, thereby requiring phonological decoding of the stimuli. Our findings indicate that early readers show explicit awareness of some orthographic conventions and implicit awareness of others, but they only showed implicit awareness when they did not have to additionally decode the stimuli. These results suggest that early orthographic knowledge may be fragile and easily masked by phonological knowledge.

The role of topic‐related background knowledge in visual attention to illustration and children's word learning during shared book reading

The purpose of this study was to examine how background knowledge of a topic may influence childrens attention to different elements of storybook illustrations and how that influences word learning. Forty-one kindergarten students were administered a test about a familiar topic (i.e., birds). Participants were then read either a fictional story about a familiar topic (birds) or a fictional story about a novel topic (wugs) on an eye-tracker monitor. Results suggest that, for children who heard the familiar story, those who knew more about the category were faster to orient to the illustration of the novel word than children with lower background knowledge. Accordingly, children who were faster to orient to the illustration were more likely to learn the word. These results may suggest that one mechanism by which background knowledge improves implicit learning in shared-book reading contexts is by guiding attention to the named elements of the illustrations.

Learning vocabulary from educational media: The role of pedagogical supports for low-income preschoolers.

This article reports on two studies designed to examine the landscape of online streamed videos, and the features that may support vocabulary learning for low-income preschoolers. In Study 1, we report on a content analysis of 100 top language- and literacy-focused educational media programs streamed from five streaming platforms. Randomly selecting two episodes from each program, we identified the prevalence of vocabulary opportunities, and the pedagogical supports—techniques or features in these media that are designed to orient children to specific vocabulary words. In over the 2,000 scenes coded, we identified two overriding categories of supports: ostensive cues, designed to provide definitional information to children; and attention-directing cues, designed to signal children’s attention to a target word. In Study 2, we use eye-tracking technology to examine which of these pedagogical supports might predict children’s ability to identify program-specific vocabulary. Results indicated that although ostensive cues predicted overall attention to scenes, attention-directing cues were most effective in directing children to target words and their subsequent word identification. Children with higher language scores were more likely to use these cues to their advantage than their lower language peers. These results may have important implications for designing digital media to enhance children’s opportunity to learn vocabulary.