Language Change & Cohort Analysis

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Abstractions about how language and behavior shift across generations, including the apparent-time hypothesis, cohort effects, second-language acquisition, and semantic narrowing or widening of word meaning.

5 abstractions in this family — domain-specific abstractions that sit near one another in structural-signature space (k-means over structural-signature embeddings). Each is shown with its short description.

• Apparent-time hypothesis — The apparent-time hypothesis infers language change by treating age-stratified speakers observed synchronically as samples of successive historical stages.
• Cohort Effect — An observed outcome difference associated with membership in groups defined by a shared birth or entry interval, kept distinct from aging, period shocks, and any unproven causal account of the cohort contrast.
• Language Sample Analysis — Elicit spontaneous language under naturalistic conditions, transcribe it with a standardized coding scheme, and score it separately across morphology, syntax, lexicon, pragmatics, and discourse against age norms, so the diagnosis reads off the dissociation profile across levels rather than any single score.
• Second-language acquisition — Second-language acquisition is a recurring identity in social sciences, humanities, and arts defined by this frozen evidence: Process in which a second or additional language is acquired after the first language has been learned.
• Semantic Narrowing and Widening — Expand/contract meaning.