Foundations of Language and Literacy Development · 14 min read
Factors That Affect Language and Literacy Development
This chapter covers the second part of Competency 0001: the many factors that influence how quickly and how well students develop language and literacy. These include early oral language and reading volume, cognitive factors such as working memory and rapid naming, linguistic, motivational, environmental, and sociocultural factors, and the characteristics of dyslexia and other reading difficulties. The exam often presents a student profile and asks which factor best explains the pattern or which response would address it most directly.
Early Oral Language as a Foundation
Oral language in the preschool years predicts later reading comprehension. Children who enter kindergarten with rich vocabulary, strong listening comprehension, and the ability to tell and understand narratives have a foundation that supports comprehension once decoding is in place. Children with weak oral language may learn to decode on schedule but then struggle with comprehension, sometimes not until the upper elementary grades when text demands rise.
The practical implication is that early childhood and primary classrooms must develop oral language deliberately, not as a by-product. Effective practices include interactive and dialogic read-alouds, extended conversations in which adults build on children's comments, explicit vocabulary instruction with child-friendly definitions, and opportunities for children to tell, retell, and explain.
Dialogic reading, developed by Whitehurst and colleagues, turns shared reading into a conversation. Adults use the PEER sequence (Prompt the child, Evaluate the response, Expand it, Repeat the prompt) and CROWD prompt types (Completion, Recall, Open-ended, Wh- questions, and Distancing prompts that connect the book to the child's life). Research has found that dialogic reading improves expressive vocabulary in young children, particularly when used consistently in small groups.
Wide Reading and Reading Volume
Once children can read, the amount they read becomes a powerful influence on vocabulary, knowledge, and fluency. Most vocabulary beyond the basics is acquired incidentally through exposure to words in text, because written language contains many more rare words than everyday conversation. Even a children's book contains more uncommon words per thousand than typical adult conversation. Reading volume also builds background knowledge and provides the repeated practice needed for automatic word recognition.
Differences in reading volume are very large. Studies of out-of-school reading have found that students at high percentiles of reading time read many times more words per year than students at low percentiles. Those differences compound over years.
Matthew Effects
Keith Stanovich used the term Matthew effects to describe the "rich get richer, poor get poorer" pattern in reading. Students who acquire early decoding skills easily find reading rewarding, read more, and therefore grow faster in vocabulary, knowledge, and fluency, which in turn makes further reading easier. Students who struggle early find reading effortful, avoid it, read less, and fall further behind, not only in word reading but in the vocabulary and knowledge that reading would have provided. Over time, a narrow early decoding problem can become a broad deficit in language and knowledge.
| Strong Early Reader | Struggling Early Reader |
|---|---|
| Decodes accurately and fluently | Decodes slowly and inaccurately |
| Enjoys reading, reads more | Avoids reading, reads less |
| Learns more words and concepts from text | Misses vocabulary and knowledge growth |
| Handles harder texts, gains more | Falls further behind as texts get harder |
Exam Tip: Matthew effects are the research rationale for early identification and intervention. If a question asks why a school should screen kindergarteners and intervene early rather than waiting, the best answer usually refers to preventing the widening gap that results from reduced reading practice.
Vocabulary as a Factor
Vocabulary is both an outcome of literacy and a driver of it. Vocabulary knowledge supports decoding (it is easier to decode a word you already know orally, because you can check your attempt against a known pronunciation), comprehension (you cannot understand a sentence if key words are unknown), and writing (precise word choice). The relationship between vocabulary and comprehension is reciprocal: knowing more words helps comprehension, and comprehending more text leads to learning more words.
Estimates suggest readers need to know roughly 95 to 98 percent of the running words in a text for adequate independent comprehension. A student who knows 90 percent of the words in a text encounters an unknown word about once every ten words, which typically overwhelms comprehension unless the teacher supports vocabulary before and during reading.
Cognitive Factors
Several cognitive processes influence how easily a child learns to read. These are not taught directly in the way phonics is, but understanding them helps a literacy specialist interpret assessment results and plan accommodations.
| Factor | What It Is | How Weakness Shows Up |
|---|---|---|
| Attention | Ability to focus and sustain effort | Inconsistent performance, skipped words or lines, incomplete work |
| Working memory | Holding and manipulating information briefly | Losing track while blending long words, forgetting the start of a sentence |
| Processing speed | How quickly simple cognitive tasks are completed | Slow reading and writing even when accurate, timed-test difficulty |
| Rapid automatized naming | Speed of naming familiar items (letters, digits, colors) | Slow, labored reading; weak fluency despite accurate decoding |
| Phonological memory | Holding sound sequences in memory | Difficulty repeating nonwords, learning new words, blending |
| Executive function | Planning, monitoring, shifting, inhibiting | Weak comprehension monitoring, disorganized writing |
Working memory is especially relevant to blending and comprehension. When a child sounds out a five-phoneme word, each sound must be held in mind while the next is retrieved, then all must be blended. Children with limited working memory benefit from continuous blending (stretching sounds together without stopping), from cumulative practice that builds automaticity, and from short sentences when first reading connected text.
Rapid automatized naming (RAN) measures how quickly a child can name a series of familiar items such as letters or colors. RAN predicts reading fluency independently of phonological awareness. A child with slow RAN may become accurate but remains slow, which is relevant to the double-deficit hypothesis described later in this chapter.
Attention difficulties, including attention-deficit/hyperactivity disorder, frequently co-occur with reading disabilities. Inattention affects learning and test performance, so a literacy specialist interprets assessments for students with attention problems carefully and may recommend shorter sessions, frequent checks for understanding, and explicit routines.
Common Trap: Cognitive factors explain why some students need more intensive instruction, but they do not justify lowering expectations or replacing reading instruction with cognitive training. Research has generally not supported training working memory or processing speed in isolation as a way to improve reading. The exam favors answers that intensify explicit literacy instruction while accommodating the cognitive weakness.
Linguistic Factors
Linguistic factors include the student's oral language proficiency in English, home language and dialect, and specific language weaknesses. Students with a developmental language disorder (sometimes called specific language impairment) have persistent difficulties with vocabulary, grammar, or narrative that are not explained by hearing loss or general cognitive impairment. Many of these students decode adequately but have significant comprehension difficulties.
Dialect is another linguistic factor. Speakers of African American English, Appalachian English, or other varieties use systematic, rule-governed language patterns that differ from the variety used in most school texts. Dialect differences are not errors in language ability. In reading, a dialect-influenced pronunciation that preserves meaning (reading "He is going" as "He goin'") should not be scored as a decoding error that reflects lack of skill, although teachers can explicitly teach contrastive analysis between home and school varieties. The exam expects respect for linguistic diversity combined with explicit instruction in the language of school texts.
Motivational Factors
Motivation affects how much students read, how persistently they work through difficulty, and how deeply they engage. Researchers such as John Guthrie, Allan Wigfield, and Linda Gambrell have identified key dimensions of reading motivation: self-efficacy (belief that one can succeed), intrinsic motivation (interest and enjoyment), valuing reading, and social motivation (reading with and for others).
Practices that support motivation include choice among worthwhile texts, texts connected to students' interests and identities, collaboration with peers, hands-on and real-world purposes for reading, and feedback that helps students see their progress. Concept-Oriented Reading Instruction (CORI), developed by Guthrie, combined science content with reading strategy instruction and motivational supports such as choice, collaboration, and hands-on experiences, and improved both motivation and comprehension.
Self-determination theory, associated with Deci and Ryan, identifies three psychological needs that support intrinsic motivation: autonomy, competence, and relatedness. Literacy classrooms that offer meaningful choice (autonomy), appropriately challenging tasks with support (competence), and community around reading (relatedness) tend to sustain engagement.
Motivation and skill are closely connected. Many older struggling readers appear unmotivated, but their avoidance often reflects years of failure. Improving skill through effective instruction frequently improves motivation, and the reverse is also true.
Classroom Scenario: A seventh-grade student reads well below grade level, refuses to read aloud, and tells his teacher that reading is "boring." Assessment shows accurate but very slow decoding of multisyllabic words. The literacy specialist recommends targeted instruction in syllable division and morphology, paired with high-interest texts at an accessible challenge level and private progress graphs showing gains in words correct per minute. The specialist explains to the teacher that the "boredom" is likely a response to effortful reading and that building skill and showing visible progress will address motivation more effectively than rewards alone.
Environmental and Sociocultural Factors
Environmental factors include access to books and print at home, availability of quality early childhood education, school resources, attendance, and stability. Socioeconomic disadvantage is associated with lower average literacy outcomes, but the association is mediated largely by access to language-rich experiences, books, and quality instruction, all of which schools can influence. Chronic absenteeism and frequent school changes interrupt instruction and are significant risk factors.
Sociocultural factors include the literacy practices valued in a student's home and community, cultural norms for interaction, and the match or mismatch between home and school discourse. Shirley Brice Heath's ethnographic research showed that communities differ in how they use language around books and questions; children from some communities were unfamiliar with the "known-answer" questions typical of classrooms (such as "What color is this?"), not because they lacked language but because their communities used questions differently. The concept of funds of knowledge, associated with Luis Moll and colleagues, emphasizes that all families possess valuable knowledge and practices that teachers can draw on.
A sociocultural perspective prevents deficit thinking. The exam consistently favors answers that recognize and build on students' cultural and linguistic resources rather than treating differences as deficits.
Hearing, Vision, and Health
Physical factors also matter. Recurrent ear infections in early childhood can cause intermittent hearing loss during critical periods of phonological development. Vision problems can interfere with sustained reading. Before concluding that a student has a learning disability, a literacy specialist confirms that hearing and vision screenings are current. Under IDEA, a specific learning disability cannot be primarily the result of visual, hearing, or motor disabilities, intellectual disability, emotional disturbance, cultural factors, environmental or economic disadvantage, or limited English proficiency.
Dyslexia
Dyslexia is a specific learning disability that is neurobiological in origin. The widely used definition adopted by the International Dyslexia Association describes it as characterized by difficulties with accurate and/or fluent word recognition and by poor spelling and decoding abilities. These difficulties typically result from a deficit in the phonological component of language that is often unexpected in relation to other cognitive abilities and the provision of effective classroom instruction. Secondary consequences may include problems in reading comprehension and reduced reading experience that can impede growth of vocabulary and background knowledge.
Each phrase of that definition carries meaning for practice. "Neurobiological in origin" means dyslexia is not caused by poor motivation, poor parenting, or low intelligence. "Accurate and/or fluent word recognition" means some students with dyslexia become accurate but remain slow. "Phonological component" points to the core deficit. "Unexpected" and "provision of effective classroom instruction" mean that the difficulty persists despite good teaching. "Secondary consequences" describes Matthew effects.
| Area | Possible Indicators |
|---|---|
| Phonological awareness | Difficulty rhyming, segmenting, or manipulating sounds |
| Letter-sound learning | Slow to learn and retain letter-sound correspondences |
| Decoding | Inaccurate reading of unfamiliar and nonsense words |
| Fluency | Slow, effortful reading, even when accurate |
| Spelling | Persistent phonetically implausible or inconsistent spelling |
| Strengths | Listening comprehension and reasoning often stronger than reading |
Common misconceptions about dyslexia appear frequently as distractors. Dyslexia is not seeing letters or words backward; reversals of 'b' and 'd' are common in all young children and reflect the challenge of learning letters whose identity depends on orientation. Colored overlays and vision therapy are not evidence-based treatments for dyslexia. Dyslexia does not reflect low intelligence. Children do not outgrow it, but they can become skilled readers with appropriate instruction, which is explicit, systematic, cumulative, multisensory where useful, and focused on phonological awareness, phonics, and fluency (often called structured literacy).
Common Trap: Reversals alone are not a reliable sign of dyslexia, and a student with dyslexia does not need vision training or colored lenses. On the exam, the strongest answers address the phonological core deficit through structured literacy instruction.
New York schools may not diagnose dyslexia as a medical condition, but students with dyslexia can be identified with a learning disability in reading under IDEA through the Committee on Special Education process, and the term dyslexia may be used in evaluations and IEPs. Early identification through universal screening is strongly encouraged.
The Phonological Deficit and the Double-Deficit Hypothesis
The phonological deficit hypothesis holds that the core problem for most students with dyslexia is in processing the sound structure of language: phonological awareness, phonological memory, and retrieval of phonological codes. Because the alphabetic principle requires mapping letters onto phonemes, weak phonological representations make that mapping difficult.
Maryanne Wolf and Patricia Bowers proposed the double-deficit hypothesis, which identifies naming speed (measured by RAN) as a second, separable source of reading difficulty. The hypothesis describes three subtypes.
| Subtype | Profile | Instructional Emphasis |
|---|---|---|
| Phonological deficit only | Weak phonological awareness, average naming speed | Phonological awareness and phonics |
| Naming-speed deficit only | Adequate phonological skills, slow RAN; accurate but slow reading | Fluency building, automaticity, extended practice |
| Double deficit | Weak phonological awareness and slow RAN | Most intensive, combined phonological, phonics, and fluency instruction |
Students with a double deficit typically have the most severe and persistent reading difficulties and need the most intensive intervention. Students with only a naming-speed deficit may be missed by screeners that emphasize accuracy, because they read correctly but slowly; timed measures help identify them.
Exam Tip: If a question describes a student who decodes accurately but reads very slowly and has slow rapid naming, think naming-speed deficit. If the student has both weak phonemic awareness and slow naming, think double deficit and the most intensive support.
Other Reading Difficulties
Not all reading difficulties are dyslexia. Some students have adequate word reading but poor comprehension; these are often called specific poor comprehenders and are discussed in Chapter 1.3. Others have mixed difficulties in both areas. Some reading difficulties are instructional in origin: students who were taught to guess words from pictures and context, or who never received systematic phonics instruction, may have weak decoding without an underlying disability. Distinguishing instructional casualties from students with a disability is one purpose of a Response to Intervention process: if a student responds well to good instruction, the difficulty was likely instructional.
Classroom Scenario: A fourth grader new to the district reads grade-level text at 72 words correct per minute with 88 percent accuracy and guesses at multisyllabic words based on the first few letters. Her listening comprehension is strong. The district she came from used a curriculum that emphasized predictable texts and picture cues. The literacy specialist administers a phonics inventory, finds gaps in vowel teams and syllable division, and places her in a Tier 2 group with explicit phonics and multisyllabic word instruction. Her response to that instruction over the next eight weeks will indicate whether the difficulty is primarily instructional or whether further evaluation is needed.
Key Takeaways
- Early oral language, vocabulary, and reading volume strongly influence later literacy; Matthew effects widen early gaps unless schools intervene early.
- Cognitive factors such as working memory, processing speed, attention, and rapid naming affect how readily students learn, but the response is intensified literacy instruction with accommodations, not isolated cognitive training.
- Linguistic, motivational, environmental, and sociocultural factors shape development; the exam rewards asset-based responses that build on students' languages, dialects, and funds of knowledge.
- Dyslexia is neurobiological, centered on a phonological deficit, unexpected given instruction and ability, and addressed through explicit, systematic structured literacy instruction; reversals and visual theories are distractors.
- The double-deficit hypothesis adds naming speed as a second source of difficulty; students with both deficits need the most intensive support.
- Some reading difficulties are instructional in origin, and response to strong instruction helps distinguish them from disabilities.
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