The Development and Characteristics of Students with Learning Disabilities · 7 min read
The Development and Characteristics of Students with Learning Disabilities
Introduction to Learning Disabilities
Learning disabilities represent a heterogeneous group of disorders that affect the acquisition, organization, retention, understanding, or use of verbal and nonverbal information. These disabilities are intrinsic to the individual and are presumed to be caused by central nervous system dysfunction. Learning disabilities are distinct from intellectual disabilities, sensory impairments, emotional disturbances, or environmental factors, though they may co-occur with these conditions.
The federal definition under the Individuals with Disabilities Education Act (IDEA) identifies a specific learning disability as a disorder in one or more of the basic psychological processes involved in understanding or using language, spoken or written, which may manifest as an imperfect ability to listen, think, speak, read, write, spell, or perform mathematical calculations. This includes conditions such as perceptual disabilities, brain injury, minimal brain dysfunction, dyslexia, and developmental aphasia. The definition explicitly excludes learning problems that are primarily the result of visual, hearing, or motor disabilities; intellectual disability; emotional disturbance; or environmental, cultural, or economic disadvantage.
Students with learning disabilities typically demonstrate average to above-average intelligence but exhibit significant discrepancies between their intellectual potential and academic achievement in specific areas. These discrepancies are not attributable to lack of effort, poor instruction, or limited educational opportunity. The neurological basis of learning disabilities means that these conditions are lifelong, though appropriate intervention and support can significantly improve functional outcomes.
Response-To-Intervention (RTI) Approach
Response to Intervention is a multi-tiered framework for the early identification and support of students with learning and behavioral needs. RTI emerged as an alternative to the traditional ability-achievement discrepancy model for identifying learning disabilities, addressing criticisms that the discrepancy model required students to fail significantly before receiving services. The RTI approach emphasizes prevention, early intervention, and data-based decision-making.
Theoretical Foundation of RTI
RTI is grounded in the premise that high-quality instruction and targeted interventions matched to student needs can improve outcomes for all learners. The framework assumes that most students will succeed when provided with evidence-based core instruction, while some students will require additional support of varying intensity. RTI shifts the focus from identifying what is wrong with the student to determining what instructional conditions are necessary for the student to learn.
The approach integrates assessment and intervention within a multi-level prevention system. Universal screening identifies students at risk for academic difficulties early, before significant gaps develop. Progress monitoring tracks student response to instruction and intervention, providing data to inform instructional decisions. The systematic use of data distinguishes RTI from previous approaches that relied heavily on clinical judgment or single-point assessments.
The Three-Tier Model
The most common RTI implementation uses a three-tier model of increasingly intensive support. Each tier represents a level of intervention, with movement between tiers based on student response to instruction as measured by progress monitoring data.
Tier 1 represents the universal level, consisting of high-quality, scientifically based instruction provided to all students in the general education classroom. This tier emphasizes evidence-based curriculum, differentiated instruction, and universal screening. Approximately 80 to 85 percent of students should demonstrate adequate progress with Tier 1 instruction alone. Core instruction at this level must be delivered with fidelity, meaning teachers implement the curriculum as designed with appropriate pacing, methods, and materials. Universal screening occurs at least three times per year to identify students who may need additional support.
Tier 2 provides targeted intervention for students who do not make adequate progress with Tier 1 instruction alone. This level typically involves small-group instruction, usually with three to five students, delivered in addition to core instruction. Interventions at Tier 2 are more intensive than core instruction, focusing on specific skill deficits identified through assessment. Sessions occur three to five times per week for 20 to 40 minutes. Progress monitoring at Tier 2 occurs more frequently, typically weekly or biweekly, to assess student response to intervention. Approximately 10 to 15 percent of students may require Tier 2 support. Students demonstrating adequate progress may return to Tier 1 support only, while those showing insufficient progress move to Tier 3.
Tier 3 represents the most intensive level of intervention, providing individualized support for students who have not responded adequately to Tier 2 interventions. Instruction at this level is highly individualized, often delivered one-on-one or in very small groups of two to three students. Interventions are longer in duration, more frequent, and specifically targeted to individual student needs based on comprehensive diagnostic assessment. Progress monitoring is most frequent at Tier 3, often occurring weekly or more often. Students receiving Tier 3 intervention who continue to demonstrate inadequate progress may be referred for special education evaluation. Approximately 5 percent of students may require Tier 3 intensity.
RTI and Learning Disability Identification
IDEA 2004 regulations permit states to use RTI as part of the process for determining whether a student has a specific learning disability. Under RTI-based identification, inadequate response to scientific, research-based intervention serves as evidence that a student may have a learning disability. This approach addresses the wait-to-fail criticism of the discrepancy model by allowing identification to occur earlier, before significant achievement gaps develop.
When using RTI for identification, documentation must demonstrate that the student was provided appropriate instruction in regular education settings delivered by qualified personnel, that repeated assessments of achievement at reasonable intervals reflecting student progress occurred during instruction, and that results were provided to the student's parents. The RTI data become part of the comprehensive evaluation required for special education eligibility determination.
Critics of RTI-based identification note potential concerns about implementation fidelity across schools and districts, the need for substantial professional development and resources, and questions about whether inadequate response to intervention alone provides sufficient evidence of a neurologically based learning disability. Many experts recommend using RTI data in combination with other assessment information rather than as the sole criterion for identification.
Essential Components of Effective RTI Implementation
Successful RTI implementation requires several essential components. A scientifically based core curriculum forms the foundation, ensuring that Tier 1 instruction meets the needs of most students. Universal screening tools with established reliability and validity identify students needing additional support. A system of progress monitoring tracks student response to instruction at all tiers. Evidence-based interventions matched to student needs are available at Tiers 2 and 3. Trained personnel deliver interventions with fidelity. A decision-making framework guides movement between tiers based on data. Administrative support and sufficient resources enable implementation.
Fidelity of implementation is critical at all levels. Without consistent, high-quality implementation of core instruction and interventions, conclusions about student response are invalid. Schools must establish systems for monitoring fidelity, providing coaching and feedback to teachers, and ensuring that interventions are delivered as designed.
Types of Disabilities
Understanding the various types of learning disabilities is essential for appropriate identification, intervention planning, and instructional design. Learning disabilities manifest in different ways depending on the cognitive processes affected and the academic domains impacted.
Dyslexia
Dyslexia is a specific learning disability that affects reading and related language-based processing skills. It is the most common learning disability, affecting approximately 5 to 10 percent of the population. Dyslexia is characterized by difficulties with accurate and fluent word recognition, poor spelling, and decoding abilities. These difficulties typically result from a deficit in the phonological component of language and are often unexpected in relation to other cognitive abilities.
The phonological processing deficit underlying dyslexia affects the ability to identify and manipulate the sound structure of language. Students with dyslexia may have difficulty recognizing that words are composed of smaller units of sound (phonemes), blending sounds together to form words, segmenting words into their component sounds, and manipulating sounds within words. These phonological processing difficulties impair the development of phonics skills necessary for decoding unfamiliar words.
Secondary consequences of dyslexia may include problems with reading comprehension and reduced reading experience that can impede vocabulary growth and background knowledge development. However, dyslexia is not primarily a comprehension disorder; when text is read aloud to students with dyslexia, their comprehension is typically commensurate with their intellectual ability.
Effective instruction for students with dyslexia emphasizes explicit, systematic phonics instruction with extensive practice opportunities. Multisensory approaches that engage visual, auditory, and kinesthetic-tactile pathways simultaneously have demonstrated effectiveness. The Orton-Gillingham approach and its derivatives represent well-established multisensory methods for teaching reading to students with dyslexia.
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