Post-telegraphic stage
The stage of language development (typically 3+ years) where children move beyond telegraphic speech, adding function words, grammatical morphemes, and more complex syntax.
Real World
Jean Berko Gleason's 'Wug Test' (1958) demonstrated that children entering the post-telegraphic stage could apply pluralisation rules to invented words ('two wugs'), proving grammatical morpheme acquisition is rule-based, not imitation.
Exam Focus
Use overgeneralisation errors (e.g. 'goed') as evidence against behaviourist imitation theory — this scores well in evaluative questions.
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