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