I tried asking both Claude Sonnet and GPT-4 (Bing CoPilot) about this, and they referred to the brain using "selective activation" to only enable language areas

I tried asking both Claude Sonnet and GPT-4 (Bing CoPilot) about this, and they referred to the brain using "selective activation" to only enable language areas for language inputs, but both talked in circles and couldn't explain how this "selective activation" actually works - how does the brain (starting from nothing - no knowledge of written language) start to selectively activate Wernicke's area only for language? Its more understandable how processing gets consolidated there, and suppressed elsewhere, once it gets started!