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· Language delay is the most common developmental disorder of childhood:
· 15% prevalence at 3 years
· 5% prevalence at school entry
Language Disorders
· Semantics: The meaning of words. phrases, and sentences.
· 3-6 months: Babbling
· 6-9 Months: Expressive babbling
· 9-12 months: Jargoning
· 12-18 mos: dyslexia, stuttering One word stage
· 18-25 months: Two word stage
· 24-36 months: Telegraphic speech
· 36-48 months: Grammatical refinement
· Input: Impaired sensory input (hearing)
· Processing: Impaired decoding, word identification, or meaning formation (related to IQ, vocabulary, reasoning, concept formation)
· Output: Impaired oral-motor ability, expression
· Endogenous Problems
· Hearing impairment dyslexia, stuttering
· Mental retardation
· Learning disabilities
· Neurological deficits
· Pure developmental language disorder
· Linguistically impoverished environments
· Lack of