Dyslexia & Learning Disabilities

About Dyslexia & Learning Disabilities

Dyslexia is a specific, neurodevelopmental learning disability, often hereditary, that primarily impairs a person’s ability to decode written language, read fluently, and spell accurately, despite average or above-average intelligence and adequate educational opportunity.

Far from being a problem with vision or visual reversal, dyslexia stems from neurobiological differences in how the brain functions, typically manifesting across four key areas:

Phonological Processing: Difficulty breaking down spoken words into their component sounds (phonemes), mapping those sounds onto written letters (graphemes), and rapidly naming letters, numbers, or words.

Reading Fluency & Accuracy: Laborious, hesitant, or inaccurate word recognition, which often degrades reading comprehension because so much cognitive energy is spent decoding individual words.

Spelling & Written Expression: Persistent difficulty retrieving correct spelling patterns, resulting in inconsistent spelling, omitted syllables, or challenge translating complex spoken thoughts into written text.

Executive & Processing Speed Demands: Slower processing speeds when reading text, leading to rapid cognitive fatigue during intensive reading or writing tasks.

Frequency: An estimated 20% of the U.S. population has dyslexia, which translates to roughly 1 in 5 people. According to data tracked by the Yale Center for Dyslexia & Creativity, it is by far the most common neurobiological learning disability, representing 80% to 90% of all individuals with any form of learning disability. Among American students who are actively placed in public school special education programs for specific learning disabilities, approximately 70% to 85% have dyslexia.

Diagnostic Gap: While up to 20% of the population shows dyslexic characteristics (around 40 million American adults), only about 2 million people have received a formal clinical diagnosis. This means nearly 75% to 95% of individuals with dyslexia navigate their reading challenges without official support or recognition.\

Gender Differences: Dyslexia affects males and females at virtually equal rates. However, boys are formally diagnosed 2 to 3 times more frequently than girls primarily because boys are more frequently referred for educational evaluations due to noticeable classroom behavioral disruptions.

Racial/Ethnic Differences: Neurologically, dyslexia affects individuals at roughly equal rates across all populations. However, there are stark racial disparities in how many people are officially identified.

Types and classifications

• In mainstream healthcare, dyslexia is generally categorized into two main types based on its origin. Developmental (inherited/present from birth) and acquired (caused by brain injury or illness). Rather than using medical subtypes, clinicians typically classify a patient's specific learning profile to guide therapy.
• Phonological Dyslexia: Also known as dysphonetic dyslexia, this is the most common profile. It is characterized by difficulty breaking down words into smaller sound units (phonemes) and difficulty sounding out unfamiliar words.
• Surface Dyslexia: Also known as dyseidetic dyslexia, this occurs when an individual struggles with whole-word recognition by sight. They can often sound out words, but have difficulty recognizing common words instantly.
• Rapid Naming Dyslexia: Difficulty rapidly recalling the names of letters, numbers, or colors. This mainly affects reading fluency and the speed at which a person can process and say words out loud.
• Double Deficit Dyslexia: When a person struggles with both phonological processing and rapid naming speed, making it one of the more complex profiles.
• Functional practitioners and neurologists categorize dyslexia as a neurodevelopmental imbalance rather than a strict learning disability. Rather than viewing it as a single diagnosis, they break it down into neurological network disruptions, processing specificities, and hemispheric imbalances where one hemisphere develops or fires more slowly than the other. Subtypes can include:
• Dysphonetic (Auditory): Characterized by a difficulty connecting letters with sounds and blending them (phonological processing issues).
• Dyseidetic (Visual): Characterized by an inability to store, recall, and recognize the visual forms of whole words.
• Mixed: A combination of both auditory and visual processing deficits.
• Motor/Cerebellar: Deficits in motor control, rhythm, and eye-tracking, which often correspond to right-cerebellar imbalances.

Symptoms associated in the NPA database

The NPA Treatment Database groups the following symptom information with Dyslexia & Learning Disabilities. This list is educational and is not a diagnostic checklist.

Treatment information in the database

The NPA Treatment Database lists 21 treatment records in connection with Dyslexia & Learning Disabilities. A database relationship does not establish that a treatment is effective, safe, or appropriate for any individual.

• Arrowsmith Program
• Brain Balance
• Cellfield
• Cogmed Working Memory Training
• Connect Listening (previously The Listening Center)
• Designs for Strong Minds
• Dr. Antonucci Functional Neurology (Concussion & Neurorehab)
• Dr. Robert Melillo / Melillo Method approaches
• Equipping Minds
• Fast ForWord / Carnegie Learning
• Integrated Listening Systems (iLs) Focus System
• Interactive Metronome (IM)
• LearningRx
• Lindamood-Bell Programs
• Meditation / Mindfulness
• Mind-Eye Institute
• Music and Art Therapy
• Photobiomodulation (PBM) / Professionally Delivered Red/Near-Infrared Light Therapy
• Plasticity Brain Center
• Sensory Integration Therapy
• Vision Therapy / Neuro-Optometric Rehabilitation

Related questions

These controlled question pages use the same stored condition and treatment relationships.

• What treatments are listed for Dyslexia & Learning Disabilities in the NPA database?

Recommended reading listed by NPA

These titles come from the current NPA condition record. Structured citation details are not yet available.

• Overcoming Dyslexia: A New and Complete Science-Based Program for Reading Problems at Any Level by Sally Shaywitz, M.D. — The definitive science-based guide to understanding dyslexia and helping readers of any age become successful.
• Soft-Wired: How the New Science of Brain Plasticity Can Change Your Life by Michael Merzenich, PhD — From a pioneering neuroscientist, practical principles for driving positive brain change at any age through targeted practice and experience.
• The Brain That Changes Itself: Stories of Personal Triumph from the Frontiers of Brain Science by Norman Doidge — Landmark exploration of neuroplasticity featuring dramatic recoveries from stroke, brain injury, and other neurological challenges.
• The Dyslexia Empowerment Plan: A Blueprint for Renewing Your Child's Confidence and Love of Learning by Ben Foss — A practical, empowering plan from a dyslexic advocate for helping children and families thrive with dyslexia.
• The Dyslexic Advantage: Unlocking the Hidden Potential of the Dyslexic Brain by Brock L. Eide, M.D. & Fernette F. Eide, M.D. — Reframes dyslexia as a different pattern of brain organization that brings unique strengths in reasoning, creativity, and big-picture thinking.
• The Woman Who Changed Her Brain: How I Left My Learning Difficulties Behind by Barbara Arrowsmith-Young — The story of a woman who used targeted cognitive exercises based on neuroplasticity to overcome severe learning disabilities.