Speech Disorders
📊 Topic Overview
| Papers Appeared | 16/28 (57.1%) | | Priority | 🔴 HIGH | | Repeated | 8 core repetitions | | Session Split | Slightly June-heavy (9/7) |
🎯 Must-Know Concepts
- Apraxia of speech — motor planning disorder
- Dysarthria — motor execution disorder
- Dyspraxia (developmental) — childhood motor speech disorder
- Dysprosody — impaired prosody/rhythm
- Articulation disorders — phoneme production errors
- Fluency disorders — stuttering and cluttering
- Voice disorders — pitch, loudness, quality problems
- Difference between aphasia and speech disorders (aphasia = language; speech disorders = motor)
Previous Year Questions
| Year-Session | Question | Marks |
|---|---|---|
| 2011-June | Discuss developmental phonological disorders | 10 |
| 2011-December | Explain speech disorders and their types | 10 |
| 2013-June | Describe speech disorders | 10 |
| 2014-June | Discuss types of speech disorders | 10 |
| 2015-June | Short note: Apraxia of Speech (B section) | 6 |
| 2016-June | Explain speech disorders | 10 |
| 2017-June | Short note: Apraxia (B section) | 6 |
| 2020-December | Speech sound disorders (B section) | 6 |
| 2021-December | Discuss the types of speech disorders | 10 |
| 2023-June | Describe speech disorders | 10 |
| 2024-June | Short note: Dyspraxia | 3 |
🌟 Comprehensive Answer: Speech Disorders (~500 words)
Introduction
Speech disorders are conditions that affect a person's ability to produce speech sounds, voice, or speech rhythm correctly. Unlike aphasia (which is a language disorder affecting linguistic knowledge), speech disorders are primarily motor-based — they involve problems with the physical production of speech sounds rather than with language understanding or formulation. Speech disorders can be acquired (due to brain damage, stroke) or developmental (present from childhood).
Key Distinction: Speech vs Language
| Disorder Type | Affects | Example |
|---|---|---|
| Speech disorder | Motor production of sounds | Apraxia, dysarthria |
| Language disorder | Linguistic processing | Aphasia |
A person with a speech disorder knows what they want to say but cannot produce it correctly; a person with aphasia has impaired access to language itself.
Types of Speech Disorders
1. Apraxia of Speech
A motor planning disorder in which the brain cannot correctly sequence and coordinate the movements needed for speech, despite normal muscle strength.
Features:
- Inconsistent errors — same word may be said differently each time
- Groping — visible struggle to find correct mouth position
- More errors on longer, complex words
- Prosody (rhythm) often affected
Causes: Stroke, TBI, brain tumours affecting Broca's area or motor cortex
Developmental apraxia of speech (DAS): A childhood disorder where children have difficulty coordinating mouth movements for speech, with no identified neurological damage.
2. Dysarthria
A motor execution disorder caused by weakness, paralysis, or incoordination of the muscles used in speech — due to neurological damage.
Features:
- Consistently slurred, slow, or weak speech
- Errors are more predictable (unlike apraxia)
- May affect articulation, voice, resonance, and respiration
Types by neurological site:
| Type | Location | Features |
|---|---|---|
| Flaccid | Lower motor neuron | Hypernasality, breathy voice |
| Spastic | Upper motor neuron | Harsh voice, slow laboured speech |
| Ataxic | Cerebellum | Scanning speech, uneven loudness |
| Hypokinetic | Basal ganglia (Parkinson's) | Monotone, reduced loudness |
3. Dyspraxia (Developmental)
Also called Childhood Apraxia of Speech (CAS). Children have difficulty coordinating the precise movements needed for speech production even without muscle weakness.
Features:
- Inconsistent errors
- Limited range of sounds (phoneme inventory)
- Difficulty imitating speech sounds
- Prosodic abnormalities
4. Articulation Disorders
Difficulties producing specific speech sounds (phonemes). Types of errors:
- Substitution: /w/ for /r/ ("wabbit" for "rabbit")
- Omission: Leaving out sounds ("ca-" for "cat")
- Distortion: Sounds produced incorrectly (e.g., lateral lisp)
5. Fluency Disorders: Stuttering and Cluttering
- Stuttering: Disrupted flow with repetitions, prolongations, or blocks
- Cluttering: Excessively rapid and irregular speech rate, often with coarticulation errors
6. Voice Disorders
Abnormalities of pitch, loudness, or quality:
- Dysphonia: General voice quality problems
- Dysprosody: Impaired speech rhythm and melody (common in apraxia and Broca's aphasia)
Conclusion
Speech disorders represent a diverse range of conditions with different underlying mechanisms — from motor planning (apraxia) to motor execution (dysarthria) to phonological development (articulation disorders). Each requires specific assessment and intervention. Understanding the distinction between speech and language disorders is fundamental in clinical and cognitive psychology, as they point to different neural systems and require different therapeutic approaches.
🧠 Memory Aid
"APP-DAV" = Apraxia, Planning, Dysarthria — then Articulation, Voice
Apraxia vs Dysarthria: "Apraxia is Planning, Dysarthria is Doing"
📚 Related Content
- 📄 Speech Disorders — Apraxia, Dysprosody, Dysarthria
- 📄 Speech Disorders — Voice, Articulation, Fluency
- 📄 Language Disorders & Aphasia
- 📄 Language Disorders — Alzheimer's, SLI, Dyspraxia
✅ Self-Assessment
- What is the key difference between apraxia of speech and dysarthria?
- What are the features of developmental apraxia of speech (DAS/CAS)?
- Name four types of dysarthria and their neurological locations.
- What is the difference between stuttering and cluttering?
- How does a speech disorder differ from a language disorder like aphasia?
💡 Exam Tips
- Apraxia vs Dysarthria is the most tested distinction — know it clearly
- For 3-mark short note on dyspraxia: definition + features + developmental context
- For 6-mark on apraxia: definition + features + developmental form
- For 10-mark: all types with a brief description each + closing distinction from aphasia
- Always distinguish speech disorders from language disorders at the start