Learning Disabilities and Developmental Differences¶

Learner Variable · All learner variables
Evidence · 103 claims (76 show a difference, 16 mixed, 11 no difference) · 59 studies (33 associational, 9 review, 6 causal, 6 quant-synthesis, 4 theoretical, 1 qualitative), q1–q4 · 10 of 59 report an effect size · 101 claims rest on one study

Description¶

Identified differences in how a learner learns: specific learning disabilities such as dyslexia and dyscalculia, autism, intellectual disability, and the special educational needs (an IEP in the United States, an EHC plan in England) that formally record them. In the research it appears as a population a design targets, as a moderator (an approach that works differently for these learners), and as a predictor of outcomes. It is distinct from access, which is about perceiving and operating the material (sensory and motor impairments, devices); a learner can need both. Attention-related differences such as ADHD sit on attention.

Implications¶

Context¶

Many effective adaptations are explicit and structured: smaller steps, more worked examples, more practice with feedback, and fewer simultaneous demands.
What a learner is entitled to (accommodations, extra time, alternative formats) is set by law and by the learner's plan, not only by the designer.

Target Learners¶

Learners with dyslexia or another specific learning disability, autistic learners, learners with intellectual disability, and learners with a recorded special educational need.

Target Learning Objectives¶

Reading, mathematics and independent-living or transition outcomes, where most of the research is.

Claims¶

Adolescents with ASD are described as frequent targets of cyberbullying because they may miss social cues and lack self-advocacy skills [+W] — learners who differ on it differ in outcomes
After the promotion gate, general education eighth graders were retained at far higher rates while retention of students with disabilities fell, raising the disabled share of ninth graders [+M] — learners who differ on it differ in outcomes
Among 2012 disability groups, youth with intellectual disability, autism, deaf-blindness, multiple disabilities, and orthopedic impairments were most at-risk in preparation for life after high school [+M] — learners who differ on it differ in outcomes
Among four-year college enrollees, former and late-arriving English Learners persisted at or above district-average rates while long-term English Learners with IEPs persisted at substantially lower rates [~W] — learners who differ on it differ in outcomes
Among students with an IEP, youth with emotional disturbance or an intellectual disability experienced more positive changes over the past decade than youth in other disability groups [+M] — learners who differ on it differ in outcomes
An additional month of relative age among peers decreases the likelihood of receiving special education services by 2-5 percent [+M] — instruction changes it
At each level of freshman course performance, students with disabilities and students two or more years below grade level are less likely to graduate than their non-disabled peers [+W] — learners who differ on it differ in outcomes
Black students and students with disabilities are disproportionately referred for behavioral threat assessments [+M] — learners who differ on it differ in outcomes
Charter students receiving special education services show smaller learning gains than matched traditional public school peers [+W] — learners who differ on it differ in outcomes
Children with disabilities showed larger gains in higher-tier programs than children without disabilities [+W] — an instructional effect differs with it
CPS students with an IEP related to a learning disability graduated at a rate approaching the district average, while students with an IEP related to another disability graduated at 54.7% [+M] — learners who differ on it differ in outcomes
Disability rates tended to fall following state special education capitation finance reforms [+M] — instruction changes it
Disengagement rates on the state summative test varied materially across gender, ethnicity, IEP status, LEP status, FRL status, and disability status [+M] — learners who differ on it differ in outcomes
Early childhood education attendance is associated with statistically significant reductions in special education placement and grade retention [+M] — instruction changes it
Educating a student with disabilities costs approximately twice as much, on average, as educating a student without a disability [+M] — learners who differ on it differ in outcomes
English learner students with disabilities are less likely than other students with disabilities to receive extra time on schoolwork but attend transition-planning meetings at a comparable rate, are suspended less, and have parents with higher expectations [~W] — learners who differ on it differ in outcomes
English learner students with disabilities are more likely to struggle academically and less likely to participate in activities than both other students with disabilities and other English learners [+W] — learners who differ on it differ in outcomes
Fourth graders with disabilities scored 40 points lower in reading and 28 points lower in mathematics than peers without disabilities on the 2022 NAEP [+M] — learners who differ on it differ in outcomes
From 2003 to 2012, youth with disabilities showed greater school engagement and support use but became less likely to participate in some key transition activities [~W] — learners who differ on it differ in outcomes
Grade retention, suspensions, and expulsions among youth with an IEP showed little change over the past decade [-W] — learners who differ on it differ in outcomes
Higher absence rates are the most important factor explaining why students with disabilities fail more courses and earn lower GPAs than students without identified disabilities [+M] — learners who differ on it differ in outcomes
A state funding report's research review, citing earlier studies, states that inclusive preschool special education benefits students with and without disabilities and that effective early education reduces later special education identification [+M] — instruction changes it
Individuals with developmental disabilities tend to prefer speech-generating devices over picture exchange and manual signs, with substantial individual differences [~M] — learners who differ on it differ in outcomes
Learning disabilities drove almost the entire rise in ninth-grade special education enrollment [+M] — learners who differ on it differ in outcomes
Most Pennsylvania students were in LEAs that prioritized students with disabilities for in-person instruction, and the pandemic made special education services harder to provide [~M] — learners who differ on it differ in outcomes
Newark magnet school special education students showed large above-state-average math growth in 2018-19 [+M] — learners who differ on it differ in outcomes
No evidence found that particular student groups are disadvantaged in oral versus written assessments [-M] — an instructional effect differs with it
Only ninth-grade students with at least a 3.0 GPA had greater than a 1-in-4 chance of attaining a college credential, across all groups except long-term English Learners with IEPs [~M] — an instructional effect differs with it
Outcomes of students with disabilities improve when they receive specially designed instruction responsive to assessment data [~M] — an instructional effect differs with it
Predictive accuracy of middle and high school indicators did not vary substantially between student groups [-M] — an instructional effect differs with it
Predictive specificity was substantially higher for NSLP-eligible, English learner, disabled, and older-entry students, with the largest difference for middle school students with disabilities predicting college enrollment [+M] — learners who differ on it differ in outcomes
Prompting a learning disability shifts feedback toward word- and sentence-level remediation, simplified vocabulary, and lowered expectations [+M] — an instructional effect differs with it
Repeated reading has potentially positive effects on reading comprehension for students with learning disabilities, with a small extent of evidence [+M] — an instructional effect differs with it
Retained third and sixth graders were placed in special education at about three times the rate of comparable low-achieving students [+W] — instruction changes it
School closings had no effect on grade retention rates or special education referrals for displaced students [-W] — instruction changes it
Single-case effects of self-management interventions are moderated by student race and special education status, with more pronounced effects for African American students and students receiving special education services [+W] — an instructional effect differs with it
Six-year graduation rates for students with behavioral and learning disabilities increased substantially between 2009 and 2019, while rates for cognitive disabilities slightly declined [+M] — learners who differ on it differ in outcomes
SRSD had potentially positive effects on writing achievement for students with a specific learning disability, with 88% of single-case experiments showing positive effects [+M] — an instructional effect differs with it
Steeper summer learning losses for students with disabilities contribute to widening disparities with peers [+M] — learners who differ on it differ in outcomes
Students of color and students with disabilities are disproportionately suspended and referred to law enforcement relative to their enrollment [+M] — learners who differ on it differ in outcomes
Students receiving special education services showed significant gains (ES +0.36) in the Michigan Tier 2 study [+M] — an instructional effect differs with it
Students with disabilities are overrepresented in school discipline: 16 percent of enrollment but 25–28 percent of suspensions and expulsions [+M] — learners who differ on it differ in outcomes
Students with disabilities are suspended at more than twice the rate of students without disabilities, and Black students with disabilities face the highest risk at 19% [+M] — learners who differ on it differ in outcomes
Students with disabilities attained postsecondary readiness and success outcomes at about one half to one third the rate of students without disabilities, the largest difference between any student group and its counterpart [+W] — learners who differ on it differ in outcomes
Students with disabilities in grades K-4 grow as much or more academically during some school years than peers without disabilities [~M] — learners who differ on it differ in outcomes
Students with disabilities suffered disproportionately from reduced instructional time and disconnection from school communities during COVID-19 [+W] — learners who differ on it differ in outcomes
Students with IEPs related to disabilities other than learning disabilities graduated at a far lower rate (46.4%) than students with learning-disability IEPs (77.5%) or without IEPs (84.6%) [+M] — learners who differ on it differ in outcomes
Students with learning disabilities and mild cognitive disabilities benefit less from rigorous study habits than students without identified disabilities, and for mild cognitive disabilities there is no relationship between study habits and course failures [~M] — an instructional effect differs with it
Teens with ASD are described as vulnerable to compulsive internet use that limits in-person social interaction [+W] — learners who differ on it differ in outcomes
The freshman on-track indicator predicts five-year graduation equally or more strongly for students with learning disabilities, mild cognitive disabilities or emotional disturbances than for students without disabilities, with on-track students two to six times more likely to graduate [+W] — an instructional effect differs with it
The initiative was associated with an overall increase in promotions to the next grade, concentrated among special education students [+M] — an instructional effect differs with it
Youth with a 504 plan face fewer functional, social, and educational challenges than youth with an IEP, but more than other youth without an IEP [+W] — learners who differ on it differ in outcomes
Youth with an IEP are more likely than a decade ago to live in households facing economic challenges [+W] — learners who differ on it differ in outcomes
Youth with an IEP are more likely than a decade ago to receive supports at school but less likely to receive them at home [~W] — learners who differ on it differ in outcomes
Youth with an IEP are more likely than their peers to be socioeconomically disadvantaged and to face problems with health, communication, and completing typical tasks independently [+W] — learners who differ on it differ in outcomes
Youth with an IEP are more likely than youth without an IEP to struggle academically, yet less likely to receive some forms of school-based support [~W] — learners who differ on it differ in outcomes
Youth with an IEP became more engaged in school and extracurricular activities over the past decade, with little change in grade retention, suspensions, and expulsions [+M] — learners who differ on it differ in outcomes
Youth with an IEP experience bullying and suspension at higher rates and are less engaged in school and social activities than peers, though most youth with and without an IEP feel positive about school [+W] — learners who differ on it differ in outcomes
Youth with an IEP lag their peers in planning and taking steps to obtain postsecondary education and jobs [+W] — learners who differ on it differ in outcomes
Self-monitoring interventions produce strong effects for students with ASD across behavioral targets and school settings (overall Tau-U = .83) [+M] — an instructional effect differs with it
Children with DD show greater brain activation than TD children in parietal, occipito-temporal and prefrontal regions during both addition and subtraction [+M] — learners who differ on it differ in outcomes
Children with DD show hyper-connectivity, not reduced connectivity, between the IPS and fronto-parietal and default mode networks during arithmetic [+M] — learners who differ on it differ in outcomes
Children with DD show slower reaction times than TD children during arithmetic problem solving, with no operation-specific RT effect [+M] — learners who differ on it differ in outcomes
Children with developmental dyscalculia are disproportionately impaired on subtraction accuracy relative to addition, showing a significant group × operation interaction [~M] — an instructional effect differs with it
Children with dyslexia are more impacted by the graphic complexity of words than both chronological-age and spelling-age matched controls [~M] — an instructional effect differs with it
Children with dyslexia show no global handwriting-quality deficit relative to chronological-age and spelling-age matched typically developing children [-M] — learners who differ on it differ in outcomes
Children with MLD are less accurate than TA peers on symbolic fraction magnitude comparisons from Grades 4 to 8 and than LA peers from Grade 5, with no group differences in growth rates on the total score [+M] — learners who differ on it differ in outcomes
DD children show operation-specific hyperactivation: greater IPS, superior parietal lobule and fusiform activity during subtraction, while during addition only the right superior parietal lobule differs (lower in DD) [~M] — an instructional effect differs with it
Fraction pairs with common denominators are compared more accurately than pairs with common numerators, but children with MLD show a crossover, improving on common numerator items while declining on common denominator items [~M] — an instructional effect differs with it
Prior research indicates children with dyslexia frequently show poor and slow handwriting skills, but the cause remained unclear [+W] — learners who differ on it differ in outcomes
Results provide no support for the IQ-achievement discrepancy model of dyslexia; non-verbal IQ correlated with all Year-1 language measures [-M] — learners who differ on it differ in outcomes
The one-half advantage in fraction comparison emerges by Grade 4 for TA children and Grade 5 for LA children, but only at Grade 7 for children with MLD, who never exceed ~75% accuracy on one-half items [+M] — learners who differ on it differ in outcomes
Visual fraction models yield more accurate magnitude comparisons than Arabic numeral fractions for all ability groups, but the visual model advantage persists through Grade 8 only for children with MLD [~M] — an instructional effect differs with it
Adolescents read silently faster than orally, and this oral–silent difference is smaller for adolescents with dyslexia than for typical readers [+M] — learners who differ on it differ in outcomes
Adults with ASD without intellectual disability show a large deficit in composite processing speed versus IQ-matched controls on standardized measures [+M] — learners who differ on it differ in outcomes
Adults with developmental dyscalculia are aware of their numerical difficulties in everyday life [+M] — learners who differ on it differ in outcomes
Adults with developmental dyscalculia are impaired in everyday numerical tasks, particularly time estimation, measure, and money usage [+M] — learners who differ on it differ in outcomes
Adults with developmental dyscalculia score significantly lower than controls on the formal NADL test of school-acquired numerical abilities [+M] — learners who differ on it differ in outcomes
Adults with dyscalculia perform the number comparison task as accurately as controls but respond significantly more slowly [+M] — learners who differ on it differ in outcomes
Adults with dyscalculia show hyper-connectivity between primary visual cortex and inferior occipital cortex and fusiform gyrus [+M] — learners who differ on it differ in outcomes
Adults with dyscalculia show less distinct non-symbolic number representations than matched controls in anterior parietal, frontal and temporal cortex [+M] — learners who differ on it differ in outcomes
After controlling for domain-general abilities and reading, MLD children show deficits on all mathematical cognition tasks while LA-Severe children show a specific counting-string intrusion deficit [+M] — learners who differ on it differ in outcomes
At all ages, children with developmental dyscalculia perform significantly lower than controls in magnitude comparison tasks using symbolic numbers [+M] — learners who differ on it differ in outcomes
Children at family-risk of dyslexia perform more poorly than typically developing controls on the cognitive foundations of arithmetic and on arithmetic itself [+M] — learners who differ on it differ in outcomes
Children with dyslexia read texts significantly more slowly than typical readers in both oral and silent reading [+M] — learners who differ on it differ in outcomes
Distance estimation is preserved in adults with developmental dyscalculia [-W] — learners who differ on it differ in outcomes
Family-risk of dyslexia and preschool language impairment are additive risk factors for reading readiness and attention and behaviour [+M] — learners who differ on it differ in outcomes
For children and adolescents with dyslexia, the silent reading deficit is as large as or larger than the oral reading deficit [+M] — learners who differ on it differ in outcomes
No group difference in the quality of symbolic number representations between adults with dyscalculia and controls [-M] — learners who differ on it differ in outcomes
No univariate activation-level differences between adults with dyscalculia and controls during symbolic or non-symbolic number processing [-M] — learners who differ on it differ in outcomes
No white-matter structural connectivity differences between adults with dyscalculia and controls in the examined tracts [-M] — learners who differ on it differ in outcomes
Reading deficits are uniquely associated with phoneme awareness and naming speed, whereas math deficits are uniquely associated with set shifting [+M] — learners who differ on it differ in outcomes
The processing speed deficit in adults with ASD appears on each of the three standardized subtests: Trail Making A, Symbol Coding, and Category Fluency [+M] — learners who differ on it differ in outcomes
Working memory, processing speed, and verbal comprehension weaknesses are shared across reading and math deficits [+M] — learners who differ on it differ in outcomes
Autistic individuals show reduced multisensory integration, most consistently for speech-related stimuli [+M] — learners who differ on it differ in outcomes
Children with specific language impairment show reduced selective attention to and integration of audiovisual speech [+M] — learners who differ on it differ in outcomes
Individuals with dyslexia show impairments in audiovisual integration beyond phoneme-grapheme mapping [+M] — learners who differ on it differ in outcomes
Multisensory temporal precision in autism is linked to speech integration, language abilities, and clinical symptomatology [+W] — learners who differ on it differ in outcomes
Shared text reading benefits students with intellectual disability whether or not they need augmentative and alternative communication systems [-M] — an instructional effect differs with it
Label effects do not differ significantly across superordinate diagnostic categories, but subcategories differ, with combined intellectual-and-learning-disability labels most negative [~M] — learners who differ on it differ in outcomes
Children with dyslexia benefit more from reading interventions than typically developing children (g = 0.87 vs 0.49) [+M] — an instructional effect differs with it
Stimming and fidgeting are associated with improved cognitive performance, while suppressing stimming consumes cognitive resources [+W] — learners who differ on it differ in outcomes
Stimming can serve as an interactional and communicative resource in collaborative activity, including in academic tasks [+W] — learners who differ on it differ in outcomes
Adolescents with dyslexia show higher reading comprehension resiliency index scores than typical readers [+M] — learners who differ on it differ in outcomes
Individual records revealed contrasting specific disabilities within the same pupil across arithmetic operations [+W] — learners who differ on it differ in outcomes

The evidence by question¶

Do learners with disabilities reach lower achievement, graduation and postsecondary outcomes than their peers, by how much, and does it differ by disability type? Students with disabilities attained postsecondary readiness and success outcomes at about one half to one third the rate of students without disabilities, the largest difference between any student group and its counterpart [+M]
Which instructional approaches improve outcomes for learners with learning, developmental or intellectual disabilities? Outcomes of students with disabilities improve when they receive specially designed instruction responsive to assessment data [+M]
Are learners with disabilities excluded from school by discipline more often than their peers? Students with disabilities are suspended at more than twice the rate of students without disabilities, and Black students with disabilities face the highest risk at 19% [+M]

Autism Spectrum Disorder — autism on its own page, with the claims about autistic learners
Access — sensory and motor impairments, assistive technology
Attention — ADHD and attentional control
Working Memory — a frequent mechanism in specific learning disabilities
Reading and Language — dyslexia sits at this boundary

Examples¶

Key Sources¶

Page metadata

Field	Value
`type`	`learner-variable`
`id`	`learning-disabilities`
`title`	`Learning Disabilities and Developmental Differences`
`description`	`Identified learning, developmental and intellectual disabilities (dyslexia and other specific learning disabilities, autism, intellectual disability), and the special educational needs that follow from them.`
`status`	`review`
`canonical`	`True`
`generated`	by `claude/unspecified` on `2026-10-13`
`trust`	unverified — no one has confirmed this page's content

Frontmatter is the page's machine-readable record — see the Schema & Guide.