Learning Disorders

Intro & DSM-5 - Brain's Learning Quirks

• Neurodevelopmental disorders; impede acquisition/use of academic skills (reading, writing, math).
• Core: Academic skills substantially & quantifiably below chronological age, despite normal intelligence & adequate schooling.
• DSM-5 Criteria Highlights:
  • Persistent difficulty for at least 6 months despite targeted interventions.
  • At least 1 of the following present: inaccurate/slow word reading, poor reading comprehension, spelling/grammar/punctuation/clarity issues in writing, difficulty with number sense/facts/calculation, or impaired mathematical reasoning.
  • Affected skills significantly interfere with academic/occupational performance or ADLs, confirmed by standardized tests & clinical assessment.
  • Onset during school-age years (may not fully manifest until demands exceed limited capacities).
  • Not better accounted for by: Intellectual Disabilities, uncorrected visual/auditory acuity, other mental/neurological disorders, psychosocial adversity, lack of language proficiency, or inadequate instruction.
• Specifiers (by domain): With impairment in Reading (dyslexia), Written Expression, Mathematics (dyscalculia). Severity: Mild, Moderate, Severe.

⭐ DSM-5 criteria emphasize difficulties persisting for at least 6 months despite targeted intervention, forming a cornerstone of diagnosis for Specific Learning Disorder (SLD).

SLD Types & Co-occurrences - Symptom Sleuthing

-   Attention-Deficit/Hyperactivity Disorder (ADHD) (**30-50%** overlap)
-   Anxiety Disorders
-   Depressive Disorders
-   Developmental Coordination Disorder (DCD)
-   Language Disorder

⭐ Dyslexia is the most common form of Specific Learning Disorder, affecting an estimated 5-15% of school-aged children.

📌 RWD Mnemonic for SLDs: Reading (Dyslexia), Writing (Dysgraphia), D 'rithmetic (Dyscalculia).

Etiology & Risk Factors - Why the Hiccups?

• Neurobiological Factors:
  • Atypical brain development & function (e.g., phonological processing deficits in dyslexia).
  • Differences in brain structure (e.g., altered planum temporale, perisylvian regions).
  • Impaired neural connectivity.
• Genetic Factors:
  • High heritability (estimates range ~40-80%).
  • Polygenic: Multiple susceptibility genes (e.g., KIAA0319, DCDC2, DYX1C1 for dyslexia).
  • Family history is a significant risk factor.
• Environmental Factors:
  • Prenatal/Perinatal: Prematurity, low birth weight, hypoxia, prenatal exposure to toxins (nicotine, alcohol).
  • Postnatal: Inadequate nutrition, lack of early cognitive stimulation, low socioeconomic status, adverse childhood experiences.

⭐ Specific Learning Disorders have a strong neurobiological origin and are highly heritable, often running in families.

Diagnosis & Intervention - Help on Horizon

• Diagnosis:
  • Comprehensive: Clinical history, psychoeducational tests (IQ, achievement), developmental assessment.
  • DSM-5: Persistent learning difficulty (≥6 months despite targeted help), academic skills substantially below age-expected, onset during school years.
  • Crucial: Rule out sensory deficits (vision/hearing), Intellectual Disability, ASD, ADHD, inadequate schooling.
• Intervention - Multimodal:
  • Multidisciplinary Team (MDT): Educators, psychologists, Speech-Language Pathologists (SLPs), Occupational Therapists (OTs).
  • Individualized Education Plan (IEP): Tailored goals & strategies.
  • Evidence-based teaching: Explicit phonics (dyslexia), problem-solving strategies (dyscalculia).
  • Accommodations: Extra time, scribe, assistive technology (e.g., text-to-speech).
  • Response to Intervention (RTI) model: Tiered support.
  • Address co-occurring conditions (e.g., ADHD, anxiety).

⭐ Early identification and tailored, evidence-based interventions (like RTI) are key to improving outcomes in SLD.

High‑Yield Points - ⚡ Biggest Takeaways

• Specific Learning Disorder (SLD): Academic skills significantly below age expectations despite adequate intelligence.
• Dyslexia: Difficulty with reading accuracy, fluency, spelling; linked to phonological deficits.
• Dysgraphia: Impaired written expression (handwriting, spelling, grammar).
• Dyscalculia: Problems with number sense, math facts, calculation.
• Diagnosis: Persistent difficulty for ≥6 months despite intervention.
• High co-morbidity with ADHD and anxiety disorders.
• Management: Individualized educational interventions; pharmacotherapy not primary.