Communication disorder Study Guide

📖 Core Concepts Communication disorder – difficulty comprehending, detecting, or using spoken or signed language; may involve verbal and non‑verbal channels. Receptive language – ability to understand spoken/written messages. Expressive language – ability to produce words, sentences, or gestures. Operational definition – the exact criteria (ASHA, DSM‑IV, DSM‑5) an agency uses; determines who is labeled “disordered.” Aphasia – language loss due to brain injury; classified by fluency, comprehension, and repetition abilities. DSM‑IV vs. DSM‑5 – DSM‑IV separates disorders (expressive, mixed, stuttering, phonological, NOS); DSM‑5 groups them into language disorder, speech‑sound disorder, and social (pragmatic) communication disorder. --- 📌 Must Remember Diagnosis = performance ≪ developmental expectation AND significant interference with academics, social life, or daily living. Exclusion: Pure hearing loss or auditory‑processing disorder ≠ communication disorder. DSM‑IV core disorders – expressive language, mixed receptive‑expressive, stuttering, phonological, NOS. DSM‑5 core disorders – language disorder, speech‑sound disorder, social (pragmatic) communication disorder, unspecified. Aphasia types (stroke/brain injury): Broca (expressive) – non‑fluent, good comprehension. Wernicke (receptive) – fluent, poor comprehension. Conduction – intact comprehension & spontaneous speech, poor repetition. Anomic – word‑finding difficulty, otherwise intact. Global – severe deficits in both comprehension & production. Primary progressive aphasia subtypes: progressive nonfluent, semantic dementia, logopenic. --- 🔄 Key Processes Diagnostic workflow Collect developmental history → administer standardized language/speech tests → compare scores to age norms → determine if substantially below expectation → evaluate functional impact (academics, social, daily living) → apply appropriate DSM criteria. Differentiating receptive vs. expressive deficits Test comprehension first (following commands, answering questions). Test expression next (naming, sentence formulation). Pattern of scores → guide classification (e.g., expressive > receptive → expressive language disorder). Aphasia assessment (Boston Diagnostic Aphasia Examination or similar) Fluency → comprehension → repetition → naming → reading/writing → map to aphasia subtype. --- 🔍 Key Comparisons DSM‑IV Expressive vs. Mixed Receptive‑Expressive Expressive: comprehension ≈ normal, production impaired. Mixed: both comprehension and production impaired. Phonological disorder (DSM‑IV) vs. Speech‑sound disorder (DSM‑5) Phonological: focus on pattern errors (e.g., “dat” for “that”). Speech‑sound: broader term including articulation and phonology. Stuttering vs. Cluttering (not in outline but common confusion) – Stuttering: repeated sounds/syllables; Cluttering: rapid, disorganized speech (note: cluttering not listed as a DSM disorder). --- ⚠️ Common Misunderstandings “All speech errors = phonological disorder.” Only persistent, pattern‑based errors qualify. “Hearing loss = communication disorder.” Hearing loss alone is excluded; it can contribute but is not the diagnosis. “Autism = communication disorder.” Autism is a separate neurodevelopmental condition; DSM‑5 distinguishes social‑pragmatic communication disorder from ASD. “Broca’s aphasia = no comprehension.” Comprehension is relatively preserved; patients may still misunderstand complex sentences. --- 🧠 Mental Models / Intuition “Traffic‑light model” – Red (no comprehension) → Yellow (partial comprehension) → Green (full comprehension). Map the patient’s ability to this scale to decide receptive vs. expressive emphasis. “Two‑track river” – One track = speech production, the other = language comprehension. Damage to one track creates the classic aphasia patterns. --- 🚩 Exceptions & Edge Cases Velopharyngeal insufficiency – nasal speech despite normal articulation; arises from soft‑palate closure failure, not a language disorder per se. Communication disorder NOS – used when symptoms cross criteria but don’t fit any specific category; often a placeholder pending further evaluation. Multilingual speakers – not labeled disordered if they follow home‑environment norms even when they differ from the majority language. --- 📍 When to Use Which Choose DSM version – Use DSM‑IV criteria only for older research or states that have not adopted DSM‑5; otherwise default to DSM‑5. Select assessment tool – Standardized language test (e.g., CELF) → suspected language disorder. Articulation test (e.g., GFTA) → suspected speech‑sound disorder. Pragmatic language checklist → suspected social (pragmatic) communication disorder. Aphasia subtype decision rule – If fluency is low → consider Broca or global; if fluency high but comprehension low → consider Wernicke; if repetition specifically impaired → consider conduction. --- 👀 Patterns to Recognize Patterned sound substitutions (“dat” for “that”) → phonological disorder. Consistently short, effortful sentences → expressive (Broca) aphasia. Fluent but nonsensical speech + lack of error awareness → receptive (Wernicke) aphasia. Word‑finding pauses with otherwise intact grammar → anomic aphasia. Nasal resonance + hypernasal airflow → velopharyngeal insufficiency. --- 🗂️ Exam Traps Distractor: “Hearing loss is a communication disorder.” – Wrong; it’s an exclusion criterion. Distractor: “Stuttering is classified under DSM‑5 as a speech‑sound disorder.” – Wrong; stuttering remains a separate disorder, not re‑classified. Distractor: “Social (pragmatic) communication disorder includes autism.” – Wrong; DSM‑5 excludes cases that meet ASD criteria. Distractor: “Global aphasia = only expressive deficits.” – Wrong; global affects both comprehension and production. Distractor: “All speech‑sound errors are due to oral‑motor dysfunction.” – Wrong; many are phonological pattern errors, not motor.