Storybooks and talk centered around shared reading contain more rare words, complex syntax, and narrative structures than the language that caregivers usually use when talking to children. Therefore, interactive storybook reading has the potential to facilitate children’s acquisition of lower level language (LLL) skills (e.g., vocabulary, grammar) and higher level language (HLL) skills (e.g., comprehension monitoring, narrative comprehension). This dissertation addresses gaps in shared storybook reading research pertaining to questions of assessment, intervention, and early literacy models. It investigates from a developmental and educational perspective how shared reading in the home literacy environment (HLE) and the child care literacy environment (CCLE) is related to children’s oral language skills. The first aim is to validate two recognition tests for German-speaking participants. This allows an objective and economic assessment of storybook exposure and adult literature exposure, both of which are related to children’s language development. The second aim is to clarify (a) the relation between parent and child as literacy agents in a home literacy model of shared reading, and (b) whether shared reading is related to children’s HLL skills besides being related to their LLL skills. The third aim is to test the effectiveness of a narrative dialogic reading intervention targeting LLL and HLL skills. To this end, four studies were conducted.
Study 1 validated a storybook title recognition test (TRT) for German-speaking preschoolers and caregivers. The TRT captures relative differences in the amount of shared reading. In structural equation models, the TRT was a unique predictor of preschoolers’ language skills, explaining about 50% of variance in language skills. By contrast, questionnaire measures of socioeconomic status and home literacy environment did not explain additional variance in language skills.
Study 2 validated an author recognition test (ART) for 13 to 80-year-old German-speaking readers. The ART is a measure of leisure reading that explains a substantial amount of variance in caregivers’ language skills, which is in turn related to children’s language development. Even though print exposure accumulates with time, several life span studies did not find a positive relation between reader age and ART scores. Study 2 used a sample of 13- to 77-year-old readers. The recognition probability of classic authors increased between ages 15 and 65. By contrast, the recognition probability of recent authors only increased between ages 15 and 45. The author mean publication year turned out to be a key variable for estimating print exposure in age-diverse samples. This author variable should be taken into account when modelling relationships between literacy environments and children’s language skills, especially if the age of caregivers varies (e.g., adolescent siblings, parents, grand-parents).
Study 3 examined how HLE and CCLE are related to preschoolers’ storybook exposure and how the storybook exposure of preschoolers, parents, and child care workers is related to LLL and HLL skills. Parents’ exposure to storybooks was a unique predictor of children’s vocabulary and grammar skills. Parents’ storybook exposure was also moderately related to children’s storybook exposure, which in turn explained unique variance in vocabulary, grammar, comprehension monitoring, and narrative comprehension. Therefore, the storybook exposure of children and parents should be conceptualized as related, but separate variables in models of the home literacy environment. Moreover, models should differentiate between LLL and HLL skills as correlates and outcomes of shared reading.
Study 4 developed a narrative dialogic reading intervention with wordless picture books that targeted preschoolers’ LLL and HLL skills. The intervention had small short-term effects on narrative comprehension and vocabulary skills. Comparisons with an alternative treatment and a no treatment group showed that the effects were due to the specific intervention contents. Individual differences in storybook exposure and general cognitive abilities did not moderate intervention gains. Children in control groups caught up after five months, with the exception of inferential narrative comprehension, where intervention effects were maintained at first follow-up. This indicates that narrative dialogic reading provided a unique opportunity to preschoolers for learning inferential narrative comprehension skills.
In sum, this dissertation provides new methods and insights for the assessment of print exposure and shows that narrative dialogic reading fosters a broad range of oral language skills. Regarding the refinement of early literacy models, additional analyses showed that, above children’s and parents’ storybook exposure, the ART was a unique predictor of LLL skills. Parental leisure reading and shared storybook reading were connected to children’s oral language skills through multiple pathways that should be represented in early literacy models.