Weekly research brief · Dyslexia

What matters.
What to do with it.

A concise, evidence-ranked scan for educational therapists—without the research-paper fog.

8 minute read4 research resources3 practice prompts

This week’s signal

The most useful uncovered evidence expands the intervention lens without displacing explicit reading instruction. Spelling and morphology offer practical extensions; language profiles deserve closer observation; computerized cognitive training remains experimental.

What matters this week

Beyond decoding: spelling, language, and carefully chosen add-ons

Vote on each one. Your feedback shapes the next scan.

High confidenceRecent backlog · Meta-analysis · Published August 28, 2025

Spelling instruction can improve reading—not merely spelling.

A meta-analysis synthesized 59 studies, 2,229 kindergarten-through-ninth-grade students with or at risk for learning disabilities, and 327 effect sizes. In controlled group designs, spelling interventions produced small but reliable effects on spelling (Hedges’ g = 0.33) and word reading (g = 0.25). Whole-word study and multilinguistic approaches produced the strongest spelling effects, while phonemic spelling instruction transferred most clearly to word reading (g = 0.45). Single-case studies reported much larger effects, but those estimates should not be compared directly with controlled-group results. The populations and intervention designs varied, and most participants were broadly classified as having or risking learning disabilities rather than exclusively diagnosed dyslexia.

Why it matters at edcahoots

Treat spelling as another route into orthographic learning. Connect dictated words explicitly to phonemes, patterns, morphemes, meaning, and retrieval—not solely to a weekly test.

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Medium confidenceRecent backlog · Systematic review · Online April 29, 2026

Dyslexia plus language disorder can create a different instructional profile.

A systematic review of 18 studies across four languages—15 cross-sectional and three longitudinal—examined children ages 3.5 to 17 with developmental dyslexia, developmental language disorder, or both. Children with both conditions generally showed the broadest and most persistent difficulties across decoding, fluency, and comprehension. Phonological processing was closely associated with decoding, while semantic and syntactic skills were especially relevant to comprehension. The pattern supports looking beyond word reading when a learner’s comprehension or oral language remains unexpectedly weak. However, diagnostic criteria and measures differed substantially, many studies were small, and the review could not establish that the combined profile caused any particular outcome. The authors reported no conflicts of interest.

Why it matters at edcahoots

When decoding improves but comprehension, vocabulary, sentence formulation, or oral-language organization remains unexpectedly weak, document the pattern and coordinate with the family’s professional team.

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Early/Uncertain confidenceRecent backlog · Randomized trial · Online July 8, 2026

Cogmed plus reading training produced large results—but in only 28 children.

Thirty Persian-speaking children described as having linguistic dyslexia were randomized to reading training alone or 25 sessions combining reading training with Cogmed working-memory exercises; 28 completed the study. The combined group showed large reported effects on low-frequency words, high-frequency words, word chains, and comprehension (partial eta squared = 0.53–0.68), with gains maintained for one month. Those numbers are interesting, but the evidence is far too early for adoption: the sample was extremely small, the study covered one language and dyslexia subtype, follow-up was short, multiple outcomes were tested, and the control group did not receive an active cognitive placebo. The accessible abstract did not disclose funding or conflicts involving the commercial product.

Why it matters at edcahoots

Do not change the core program yet. If EdCahoots explores cognitive-training software, use a measured pilot layered onto—not substituted for—reading instruction.

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Medium confidenceEvergreen catch-up · Randomized study · Online February 7, 2024

Morphology appears most useful for spelling complex words.

In a randomized study of 82 French-speaking students with dyslexia ages 9 to 14, explicit and intensive derivational-morphology training improved morphological awareness and the spelling of complex words. Gains extended to untrained spelling items and generally remained two months later. Reading results were more constrained: accuracy and speed improved strongly for practiced words, but transfer to untrained-word reading was small or absent. The study therefore supports morphology as a complement to phonological instruction, especially for spelling and word analysis, rather than as a general reading shortcut. French morphology differs from English, the comparison group continued business-as-usual speech-language therapy, and broader English-language replication is needed before assuming the same magnitude of benefit.

Why it matters at edcahoots

For older students, add brief work on bases, prefixes, suffixes, word families, and meaning—while measuring spelling and reading transfer separately.

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Worth watching

Promising, but not practice-changing yet.

The Cogmed trial creates a testable hypothesis—not an adoption case: does cognitive training add value beyond equally intensive reading practice? Larger English-language trials with active controls and longer follow-up would materially change the assessment.

Questions for the team

Turn evidence into a useful conversation.

Are spelling outcomes tracked as deliberately as decoding and fluency?

Which observations should trigger a conversation about broader oral-language needs?

Could a four-week morphology mini-cycle be tested using trained and untrained words?

The feedback loop

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Weekly dyslexia research briefAugust 9, 2026

What matters this week

Beyond decoding: spelling, language, and carefully chosen add-ons

Strong spelling instruction belongs beside reading work; broader language weaknesses may signal added support needs; promising computerized and morphology add-ons require careful interpretation.

High confidence · Recent backlog · Meta-analysis · Published August 28, 2025

Spelling instruction can improve reading—not merely spelling.

Takeaway

Spelling instruction produces modest spelling and word-reading gains, with phonemic approaches transferring most clearly to reading.

Practice implication

Connect dictated words to sounds, patterns, morphemes, meaning, and retrieval.

Medium confidence · Recent backlog · Systematic review · Online April 29, 2026

Dyslexia plus language disorder can create a different instructional profile.

Takeaway

Combined dyslexia and language difficulties are associated with broader weaknesses spanning decoding, fluency, and comprehension.

Practice implication

Track unexpected language and comprehension weaknesses, then coordinate with the family’s professional team.

Early/Uncertain confidence · Recent backlog · Randomized trial · Online July 8, 2026

Cogmed plus reading training produced large results—but in only 28 children.

Takeaway

A tiny trial found gains from Cogmed plus reading instruction, but it does not yet justify adoption.

Practice implication

Treat cognitive-training software as a measured adjunct, never a replacement for reading instruction.

Questions for the team

• Are spelling outcomes tracked as deliberately as decoding and fluency?

• Which observations should trigger a conversation about broader oral-language needs?

Primary sources

1. Chandler et al. · Journal of Learning Disabilities: https://doi.org/10.1177/00222194251364836

2. Andreou & Sepeti · Annals of Dyslexia: https://link.springer.com/article/10.1007/s11881-026-00369-y

3. Nikbin et al. · Applied Neuropsychology: Child: https://pubmed.ncbi.nlm.nih.gov/42417526/

What matters.What to do with it.

Beyond decoding: spelling, language, and carefully chosen add-ons

Spelling instruction can improve reading—not merely spelling.

Dyslexia plus language disorder can create a different instructional profile.

Cogmed plus reading training produced large results—but in only 28 children.

Morphology appears most useful for spelling complex words.

Promising, but not practice-changing yet.

Turn evidence into a useful conversation.

Your reaction changes next week’s brief.

Beyond decoding: spelling, language, and carefully chosen add-ons

Spelling instruction can improve reading—not merely spelling.

Takeaway

Practice implication

Dyslexia plus language disorder can create a different instructional profile.

Takeaway

Practice implication

Cogmed plus reading training produced large results—but in only 28 children.

Takeaway

Practice implication

Questions for the team

Primary sources

What matters.
What to do with it.