International assessments show that 20% of adolescents cannot read simple texts with understanding. Despite this, research has focused on early reading in childhood and skilled reading in adulthood, neglecting reading development during adolescence. We report a longitudinal study assessing reading and vocabulary development at 12, 13 and 14 years in a sample of 210 adolescents who were unselected for ability. Word reading accuracy, word reading fluency, reading comprehension, receptive vocabulary and expressive vocabulary were assessed using standardized assessments. Latent variable models showed consistent rank order amongst individuals (high stability), significant progress over time, and evidence that achievement gaps between the least and most able adolescents were narrowing. Oral vocabulary knowledge and reading comprehension were best conceptualized as indices of a common language construct. Low levels of reading proficiency were also observed in a substantial proportion of this sample, underlining the importance of providing ongoing reading and language support during adolescence. Despite a widespread assumption that children can read when they leave primary education, international assessments show that 20% of adolescents are not able to read simple texts accurately and with understanding (Jerrim & Shure, 2016). These pupils will struggle to read independently, limiting access to the curriculum and hampering educational progress. Yet, very little is known about reading difficulties and reading development in adolescence, with research and theory focusing on reading in childhood and adulthood. Particularly lacking are longitudinal studies of adolescent reading: to our knowledge only one study has tracked reading within adolescence (see Francis, Shaywitz, Stuebing, Shaywitz, & Fletcher, 1996). We collected longitudinal data on word reading and reading comprehension at ages 12, 13 and 14 years. Spoken vocabulary knowledge was also assessed, as it is crucial for successful reading comprehension. Reading development in adolescence Beginning readers must learn how letters map onto sounds and then to read words and sentences accurately and efficiently. Once accurate and efficient reading is in place, a reader can allocate resources to reading comprehension, which is underpinned by spoken language comprehension (e.g., Gough & Tunmer, 1986). By late childhood, most children can read a range of texts accurately, efficiently and with comprehension, so it might be tempting to assume that little reading development takes place after this point. However, we know that the brain continues to develop during adolescence (Blakemore, 2018), and this includes the brain regions involved in reading (e.g., Ben-Shachar, Dougherty, Deutsch, & Wandell, 2011). Longitudinal studies of reading development in

The process by which morphologically complex words are recognized and stored is a matter of ongoing debate. A large body of evidence indicates that complex words are automatically decomposed during visual word recognition in adult readers. Research with developing readers is limited and findings are mixed. This study aimed to investigate morphological decomposition in visual word recognition using cross-sectional data. Participants (33 adults, 36 older adolescents [16 to 17 years], 37 younger adolescents [12 to 13 years], and 50 children [7 to 9 years]) completed a timed lexical-decision task comprising 120 items (60 nonwords and 60 real word fillers). Half the nonwords contained a real stem combined with a real suffix (pseudomorphemic nonwords, e.g., earist); the other half used the same stems combined with a nonmorphological ending (control nonwords, e.g., earilt). All age groups were less accurate in rejecting pseudomorphemic nonwords than control nonwords. Adults and older adolescents were also slower to reject pseudomorphemic nonwords compared with control nonwords, but this effect did not emerge for the younger age groups. These findings demonstrate that, like adults, children and adolescents are sensitive to morphological structure in online visual word processing, but that some important changes occur over the course of adolescence.

The onset of literacy marks a significant change in children’s development. Written language is more complex than everyday conversation, and even books targeted at preschoolers contain more varied words and more complex syntax than child-directed speech does. We review the nature and content of children’s book language, focusing on recent large-scale corpus analyses that systematically compared written and spoken language. We argue that exposure to book language provides opportunities for learning words and syntactic constructions that are only rarely encountered in speech and that, in turn, this rich experience drives further developments in language and literacy. Moreover, we speculate that the range, variety, depth, and sophistication of book language provide key input that promotes children’s social and emotional development. Becoming literate changes things, and researchers need to better understand how and why reading experience shapes people’s minds and becomes associated with a range of skills and abilities across the life span.

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As written language contains more complex syntax than spoken language, exposure to written language provides opportunities for children to experience language input different from everyday speech. We investigated the distribution and nature of relative clauses in three large developmental corpora: one of child-directed speech (targeted at pre-schoolers) and two of text written for children – namely, picture books targeted at pre-schoolers for shared reading and children’s own reading books. Relative clauses were more common in both types of book language. Within text, relative clause usage increased with intended age, and was more frequent in nonfiction than fiction. The types of relative clause structures in text co-occurred with specific lexical properties, such as noun animacy and pronoun use. Book language provides unique access to grammar not easily encountered in speech. This has implications for the distributional lexical-syntactic features and associated discourse functions that children experience and, from this, consequences for language development.