Language disorder Study Guide

📖 Core Concepts Language disorder – persistent difficulty acquiring/using listening and speaking skills; can affect phonology, syntax, morphology, semantics, pragmatics. Speech disorder – problem with the physical act of producing sounds; the message content is usually intact. Expressive vs. Receptive Expressive: trouble producing words or sentences. Receptive: trouble understanding spoken or written language. Developmental Language Disorder (DLD) – primary spoken‑language disability with no known medical cause, lasting beyond childhood; also called Specific Language Impairment (SLI). Acquired Aphasia – language loss after left‑hemisphere brain damage (stroke, TBI, neurodegeneration). Key aphasia types Wernicke’s: fluent speech, poor comprehension, impaired repetition. Broca’s: non‑fluent speech, good comprehension, intact repetition. Conduction: good comprehension & fluency, poor repetition. Transcortical Sensory: like Wernicke’s but spared repetition. Primary Progressive Aphasia (PPA) – neurodegenerative; three variants (semantic, agrammatic/non‑fluent, logopenic). 📌 Must Remember Prevalence: 7 % of young children have DLD. Sex ratio: boys diagnosed ≈ 2 × girls. Risk factors: low birth weight, prematurity, birth complications, brain trauma, male gender, family history, low parental education. Co‑occurring conditions: ADHD, autism, Down syndrome, dyslexia, behavioral disorders. Aphasia hallmark – left‑hemisphere lesion → language processing deficits. Wernicke’s aphasia → fluent, meaningless speech; Broca’s aphasia → halting, meaningful speech. Conduction aphasia → preserved comprehension & fluency but marked repetition errors. PPA variants – Semantic: loss of word meaning, naming difficulty. Agrammatic: reduced output, grammar errors. Logopenic: word‑finding pauses, repetition trouble. Treatment goal – improve functional communication and academic access; strength‑based, caregiver‑centered. 🔄 Key Processes Assessment & Diagnosis Identify persistent language difficulty across domains → rule out hearing loss, neurological disease. Determine expressive vs. receptive profile → classify DLD vs. other disorders. Early Intervention (0‑3 yr) Train caregivers to respond contingently to child’s communication attempts. Embed language targets in natural routines. Preschool Intervention (≈ 3 yr) Increase language exposure frequency and saliency. Implement family‑centered care; parents practice targets daily. School‑Age Intervention Match therapy intensity to academic language demands. Use evidence‑based strategies (implicit knowledge, controlled placement, high trial exposure). Aphasia Management Identify aphasia type → select therapy focus (e.g., comprehension drills for Wernicke’s, speech‑generation for Broca’s, repetition drills for conduction). For PPA, tailor to variant (semantic training, syntax shaping, word‑retrieval exercises). 🔍 Key Comparisons Speech disorder vs. Language disorder Speech: motor‑articulatory problem → sound production impaired. Language: cognitive‑linguistic problem → message content impaired. Expressive vs. Receptive language disorder Expressive: difficulty producing words/sentences. Receptive: difficulty understanding language. Wernicke’s vs. Broca’s aphasia Fluency: Wernicke’s = fluent; Broca’s = non‑fluent. Comprehension: Wernicke’s = poor; Broca’s = intact. Repetition: both poor, but in TSA repetition is spared. PPA variants Semantic: loss of meaning; Agrammatic: grammar/syntax loss; Logopenic: repetition & word‑finding loss. ⚠️ Common Misunderstandings “All speech problems are language problems.” – Speech disorders affect articulation only; language content can be normal. “Aphasia always means non‑fluent speech.” – Wernicke’s and transcortical sensory aphasias are fluent. “DLD is caused by low intelligence.” – DLD is a specific language deficit; overall cognition can be typical. “If a child can repeat words, they have no aphasia.” – Repetition can be spared in transcortical sensory aphasia despite severe comprehension loss. 🧠 Mental Models / Intuition Two‑channel model: Think of language as input (receptive) ↔ output (expressive). Damage to one side creates a “broken pipe” on that side only. Fluency vs. Meaning: Fluency ≈ “how smoothly you speak”; Meaning ≈ “how much you understand.” Plotting these yields the classic aphasia map (Wernicke = high fluency/low meaning; Broca = low fluency/high meaning). Progressive vs. Acquired: PPA = “degenerative slide” (gradual loss) vs. stroke‑related aphasia = “sharp drop.” 🚩 Exceptions & Edge Cases Transcortical Sensory Aphasia – like Wernicke’s (fluent, poor meaning) but repetition is intact because the surrounding cortex is spared. Conduction Aphasia – comprehension and fluency are preserved yet repetition is impaired; reflects disruption of the arcuate fasciculus. DLD co‑occurrence – may appear isolated but often hides ADHD, autism, or dyslexia; always screen for comorbidities. 📍 When to Use Which Age‑based intervention 0‑3 yr: caregiver‑responsive interaction → early intervention protocol. ≈ 3 yr: language‑rich routines + parent‑training → preschool protocol. School‑age: target academic language, use high‑trial implicit strategies. Aphasia therapy selection Poor comprehension: focus on Wernicke‑type drills (semantic mapping, auditory discrimination). Non‑fluent speech: use Broca‑type approaches (sentence‑building, phrase‑expansion). Repetition deficit: apply conduction‑type drills (repetition hierarchies). Progressive decline: choose variant‑specific exercises (semantic feature analysis for semantic PPA, grammar shaping for agrammatic PPA). 👀 Patterns to Recognize Fluent but nonsensical speech → suspect Wernicke’s or TSA. Halting speech with good comprehension → suspect Broca’s. Good comprehension & fluency + repeat errors → conduction aphasia. Invented words (neologisms) + loss of meaning → TSA. Gradual loss of specific language domain (naming, grammar, repetition) → PPA variant. Co‑occurring behavioral or neurodevelopmental diagnoses → likely DLD with comorbidity. 🗂️ Exam Traps Distractor: “Speech disorder = language disorder.” – Wrong: content vs. production. Distractor: “All aphasia patients have impaired comprehension.” – Wrong: Broca’s and conduction aphasias retain comprehension. Distractor: “Repetition deficits only occur in conduction aphasia.” – Wrong: Wernicke’s and Broca’s also show poor repetition; conduction is specifically impaired with otherwise intact language. Distractor: “DLD prevalence is <1 %.” – Wrong: actual prevalence is about 7 %. Distractor: “PPA is an acute post‑stroke condition.” – Wrong: PPA is neurodegenerative, progressive over years. --- Use this guide for a quick, high‑yield review before your exam. Focus on the bolded contrasts and the patterns—they’re the most test‑friendly.