Matching Pairs Critical PeriodOnline version Critical Period by Jenny Sanjuanita 1 Isabelle (1930) 2 Noam Chosmky 3 The czech twins (1972) 4 Genie (1970) 5 Universal Grammar Languages need to have generalizable grammatical rules 1965. Proposed Language Acquisition Device (LAD) They had been kept locked in insolation in a cellar with only each other for company. They little speech and communicated mostly in gestures. Her case served to study wheter language could be taught even after critical periods for language development had been missed. Her deaf-mute mother as her only contact. She had no sense of language.
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