Language Acquisition
The Principles and Parameters approach is the postulated answer to Plato's Problem: how can children with different linguistic environments arrive at an accurate grammar that exhibits universal and non-obvious similarities, relatively rapidly, and with finite input. According to this framework, principles and parameters are part of a genetically innate universal grammar (UG) which all humans possess, barring any genetic disorders. As such, principles and parameters do not need to be learned by exposure to language. Rather, exposure to language merely triggers the parameters to adopt the correct setting. The problem is simplified considerably if children are innately equipped with mental apparatus that reduces and in a sense directs the search space amongst possible grammars. The P&P approach is an attempt to provide a precise and testable characterization of this innate endowment which consists of universal "Principles" and language-specific, binary "Parameters" that can be set in various ways. The interaction of the principles and the parameter settings produces all known languages while excluding non-natural languages.
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