critical periods

Chomsky's Theory of Language Development discusses "critical periods" for learning language.  Following from this theory, disruptions during critical periods should negatively affect the development of language. 

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Other resources about feral children are in this week's reading list.

Obviously, these are horrific cases of child abuse.

1. What do the case of Genie and your readings tell us about language (and emotional) development? 
2. What cues can educators take from these tragic cases?