Source: Abnormal Psychology, University of Florida
Tags: specific learning disorder, dyslexia, communication disorder, language disorder, speech sound disorder, stuttering, childhood-onset fluency disorder, social communication disorder, motor disorder, Tourette's, tic disorder, stereotypic movement disorder, developmental coordination disorder, IEP, Broca's area, DSM-5
Difficulty: Intermediate | Prerequisites: Chapter 10 overview of neurodevelopmental disorders, basic neuroanatomy (frontal lobe, temporal lobe).
Big picture: This section covers a cluster of neurodevelopmental conditions that affect academic skills, language, and movement. They share a common thread: genetic and neurological underpinnings, onset in childhood, and the potential for targeted intervention to meaningfully change outcomes. These disorders are frequently comorbid with one another and with ADHD. The key treatment framework is the Individualized Education Plan (IEP) mandated by the Individuals with Disabilities Education Act.
Specific learning disorders affect reading, writing, or maths; communication disorders affect language production or social use of language; motor disorders include tic disorders (Tourette's), stereotypic movement disorder, and developmental coordination disorder. All have genetic and neurological contributors, and treatment focuses on building missing skills through structured intervention.
Specific learning disorder
Deficits in one or more academic skills (reading, written expression, and/or mathematics) that persist for at least 6 months despite targeted intervention. Performance is substantially below age expectations. Think of it as a gap between a child's intellectual ability and their academic achievement in a specific area.
Dyslexia
A specific learning disorder in reading, usually apparent by fourth grade. Involves poor word reading accuracy, slow reading rate, reading comprehension weakness, and often difficulty in maths and written expression. Affects about 4% of children, mainly boys.
Language disorder
Persistent difficulties with spoken language, written language, and other language modalities (e.g. sign language), including problems with vocabulary, grammar, narrative, and pragmatic language abilities.
Speech sound disorder
Persistent difficulty producing speech sounds appropriate for the individual's age or dialect. May involve substituting one sound for another (e.g. "t" for "k") or omitting certain sounds (e.g. final consonant of words).
Childhood-onset fluency disorder (stuttering)
A disturbance in the normal fluency and timing of speech, involving repetition of sounds and syllables, prolongation of consonants and vowels, and pauses within words. Starts before age 10, prevalence 0.3–5%, twice as many boys, and about 80% recover on their own by age 16.
Social communication disorder
Deficits in using verbal and nonverbal communication for social purposes, such as greeting others and sharing information in a context-appropriate manner. Social participation and relationships are often impaired. Distinguished from ASD by the absence of restricted, repetitive behaviours.
Tics
Sudden, rapid, recurrent, nonrhythmic motor movements or vocalisations. Examples include jerking of the head, eye blinking, grimacing, throat clearing, sniffing, and grunting. A tic is preceded by an urge, and performing the tic temporarily reduces it.
Tourette's disorder
A tic disorder involving both multiple motor tics and one or more vocal tics present at some time during the illness (not necessarily concurrently). More debilitating and more often comorbid with ADHD and OCD than other tic disorders. Prevalence approximately 1%.
Persistent motor or vocal tic disorder (PMVTD)
A single motor or vocal tic, persistent for 1+ year, with onset before age 18. Less debilitating than Tourette's. Prevalence 3–4%.
Stereotypic movement disorder
Repetitive, seemingly driven, and apparently purposeless motor behaviour that causes clinically significant distress or functional impairment. Differs from tics in that the behaviours are sustained over an extended period. Often seen alongside autism, intellectual disability, or ADHD.
Developmental coordination disorder
Fundamental deficits or significant delays in the development of basic motor skills, not explained by a medical condition (e.g. muscular dystrophy). Affects 5–6% of children (more boys than girls), comorbid with other disorders in about 50% of cases (especially ADHD). Causes are not well understood; treated with physical or occupational therapy.
Broca's area
The inferior frontal gyrus of the brain, involved in the ability to articulate and analyse words. Abnormalities here are linked to learning and communication disorders.
Individualized Education Plan (IEP)
A structured plan mandated by the Individuals with Disabilities Education Act. Describes a child's specific skill deficits (determined by formal tests and parent/teacher observations) and lays out strategies to overcome them.
Habit reversal therapy
A behavioural treatment for tics and stereotypic movements in which triggers and early signs of impending tics are identified, and the client is taught to engage in competing behaviours instead.
DSM-5 Criteria (pg. 296)
Criterion A: Difficulties learning and using academic skills, with 1+ of the following persisting for at least 6 months despite targeted intervention:
Inaccurate or slow, effortful word reading
Difficulty understanding the meaning of what is read
Difficulty spelling
Difficulty with written expression
Difficulty mastering number sense, number facts, or calculation
Difficulties with mathematical reasoning
Criterion B: Affected skills are substantially and quantifiably below age expectations and cause significant interference with academic/occupational performance or daily living. Confirmed by standardised achievement measures and clinical assessment. For individuals 17+, a documented history may substitute for standardised assessment.
Criterion C: Difficulties begin during school-age years (may not fully manifest until demands exceed capacity).
Criterion D: Not better accounted for by other conditions.
Dyslexia specifically
Usually apparent by fourth grade.
Poor word reading accuracy, slow reading rate, reading comprehension weakness, plus difficulty in maths and written expression.
Affects about 4% of children, mainly boys.
High risk of dropping out of school due to demoralisation from low academic performance.
Emotional side effects can also impact social relationships.
Four types, each with persistent difficulties:
Language disorder: Difficulties with spoken language, written language, and other modalities. Problems with vocabulary, grammar, narrative, and pragmatic abilities.
Speech sound disorder: Difficulty producing age-appropriate speech sounds. Sound substitution or omission.
Childhood-onset fluency disorder (stuttering): Repetition and prolongation of sounds, pauses within words. Usually worse under pressure to speak well. Starts before age 10; 80% recover by age 16.
Social communication disorder: Deficits in using language for social purposes (greeting, sharing information appropriately for context). Impairs social participation and relationships.
Tic disorders
Tourette's (1%): multiple motor tics plus one or more vocal tics. More debilitating, more comorbid with ADHD/OCD.
PMVTD (3–4%): single motor or vocal tic, persistent 1+ year, onset before 18.
Tics are preceded by an urge; performing the tic temporarily reduces it.
All begin in childhood, increase through adolescence, and typically decline in adulthood.
Highly comorbid with OCD.
Associated with dopamine system dysfunctions in the cerebrum, basal ganglia, and frontal cortex.
Stereotypic movement disorder
Repetitive, apparently purposeless motor behaviour sustained over an extended period (unlike the brief, sudden quality of tics).
Often co-occurs with autism, intellectual disability, or ADHD.
Developmental coordination disorder
Fundamental deficits in basic motor skills, 5–6% of children (more boys).
Comorbid with other disorders (50% ADHD).
Causes not well understood; highly heterogeneous.
Treated with physical or occupational therapy.
Genetic factors: Genetic abnormalities contribute, but no single gene is responsible.
Brain structure abnormalities:
Broca's area (inferior frontal gyrus): articulation and word analysis.
Parietotemporal region: mapping visual perception of printed words onto language structure.
Occipitotemporal region: rapid, automatic, fluent word identification. Dyslexia is associated with unusually low activity here.
Environmental factors: Lead poisoning, birth defects, sensory deprivation, low socioeconomic status all increase risk of damage to critical brain areas.
Therapies designed to build missing skills.
The Individuals with Disabilities Education Act mandates that interventions are bundled in a child's Individualized Education Plan (IEP).
Specialised instruction can produce measurable changes in brain functioning (e.g. dyslexia tutoring increases activity in the occipitotemporal region).
Habit reversal therapy for tics and stereotypic movements: identify triggers, teach competing behaviours.
The IEP system is the practical mechanism through which most children with learning and communication disorders receive intervention in the United States. The finding that targeted tutoring for dyslexia can change brain activity patterns is a powerful demonstration of neuroplasticity and reinforces the value of early, evidence-based intervention.
Students sometimes think dyslexia means seeing letters backwards. The core features are poor word reading accuracy, slow reading rate, and comprehension weakness.
Students may confuse social communication disorder with ASD. Social communication disorder lacks the restricted, repetitive behaviours that define ASD.
Students often think tics are voluntary. Tics are involuntary, though they are preceded by an urge and temporarily relieved by performing them.
Students may assume stuttering is caused by anxiety. While pressure can worsen it, childhood-onset fluency disorder is a neurodevelopmental condition, not an anxiety disorder.
⚠️ Know the DSM-5 criteria for specific learning disorder and the six academic-skill areas it covers.
⚠️ Be able to distinguish the four communication disorders from one another and from ASD.
⚠️ Understand the difference between Tourette's and PMVTD (both tics vs. single; Tourette's more debilitating and comorbid).
⚠️ The three brain regions relevant to learning/communication disorders (Broca's area, parietotemporal, occipitotemporal) are testable, especially the link between dyslexia and low occipitotemporal activity.
⚠️ Know what an IEP is and the legislation behind it (Individuals with Disabilities Education Act).
True or false: Dyslexia is usually apparent by first grade. (False, typically by fourth grade.)
Fill in the blank: ________ disorder involves deficits in using language for social purposes, without the restricted repetitive behaviours seen in ASD. (Social communication.)
True or false: About 80% of children with stuttering recover on their own by age 16. (True.)
Fill in the blank: Tourette's disorder requires both multiple ________ tics and one or more ________ tics. (Motor; vocal.)
True or false: Developmental coordination disorder is equally common in boys and girls. (False, it affects more boys.)
Q: What distinguishes a specific learning disorder from general intellectual disability?
A: A specific learning disorder involves deficits in particular academic skills (reading, writing, maths) while overall intellectual functioning may be normal. Intellectual disability involves broader deficits across conceptual, social, and practical domains.
Q: Name the three brain regions implicated in learning and communication disorders and their functions.
A: Broca's area (inferior frontal gyrus) for articulation and word analysis; the parietotemporal region for mapping visual perception of words onto language structure; and the occipitotemporal region for rapid, fluent word identification.
Q: How does social communication disorder differ from autism spectrum disorder?
A: Social communication disorder involves deficits in the social use of language and nonverbal communication, but it does not include the restricted, repetitive behaviours that are required for an ASD diagnosis.
Q: What is habit reversal therapy, and what conditions is it used for?
A: Habit reversal therapy identifies triggers and early signs of impending tics or stereotypic behaviours and teaches clients to perform competing behaviours instead. It is used for Tourette's disorder, PMVTD, and stereotypic movement disorder.
Q: What evidence supports the effectiveness of specialised instruction for dyslexia?
A: Targeted dyslexia tutoring has been shown to increase brain activity in the occipitotemporal region, the area responsible for rapid, automatic word identification, demonstrating that intervention can change brain functioning.
Specific learning disorders frequently co-occur with ADHD (20–25% overlap noted in the ADHD section). Communication disorders connect to the social deficits seen in ASD, and social communication disorder sits at the boundary between the two. Motor disorders, particularly Tourette's, link to OCD (high comorbidity) and to dopamine system dysfunction discussed in both ADHD and psychotic disorders chapters. The IEP framework connects to broader educational psychology and policy discussions.
Specific learning disorder, dyslexia, reading disorder, dyscalculia, dysgraphia, communication disorder, language disorder, speech sound disorder, stuttering, childhood-onset fluency disorder, social communication disorder, motor disorder, tic, Tourette's disorder, Tourette syndrome, PMVTD, persistent motor vocal tic disorder, stereotypic movement disorder, developmental coordination disorder, Broca's area, occipitotemporal region, IEP, Individualized Education Plan, Individuals with Disabilities Education Act, habit reversal therapy, neuroplasticity