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I'm not sure what you're implying. The fact that we are not consciously aware of parsing grammatical structures doesn't mean it doesn't happen.

For example we know for sure that the brain applies sophisticated mathematical algorithms to signals coming from the ears to locate sound in 3D space, yet we are certainly not consciously aware of it - we just "know" where the source is located

Regarding grammar, there is a theory called Universal Grammar from Chomsky that we are born with grammar structures in the brain.

Some recent news on it - http://www.medicaldaily.com/noam-chomskys-theory-universal-g...

[sidek]

Disclaimer: this very article was used by a linguistics professor of mine to show why not to trust the popular news reporting and look at the study.

It's a very good study, but does NOT prove `UG' once and for all.