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" The fact that early languages, no matter how many there are, utilize the same streams implies that the brain doesn't have a native language. The brain can only reflect the fact that a set of neural circuits was built and activated for a certain period of time. Nor does the brain care if those neural circuits map onto things that the rest of the world calls languages or dialects. It really cares only about what activates those circuits. Thus, the brain patters that typify language use across skill levels can be mapped.
Brain imaging technology monitors the intensity of oxygen use around the brain - higher oxygen use represents higher energy use by cells burning glucose. The deeply engrained language circuits will create dim MRI images, because they are working efficiently, requiring less glucose overall. More recently acquired languages, as well as those used less frequently, would make neural circuits shine more brightly, because they require more brain cells, thus more glucose. "
― Michael Erard , Babel No More: The Search for the World's Most Extraordinary Language Learners
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" That was the main thing wrong with Mrs. Kamal. She spent such an extraordinary amount of mental energy feeling irritated that it was impossible not to feel irritated in turn. It was oxygen to her, this low-grade dissatisfaction, shading into anger; this sense that things weren't being done correctly, that everything from the traffic noise at night to the temperature of the hot water in the morning to the progress of Mohammed's potty training to the fact that Fatima wasn't being taught to read Urdu, only English, to the fact that Rohinka served only two dishes at dinner the night of her arrival to the cost of the car insurance for the VW Sharan to the fact that Shahid didn't have a 'proper job' and seemed to have no intention of getting one, let alone a wife, to the unfriendliness of London, the fact that it was an 'impossible city,' to the ostentatious way she complained about missing Lahore, especially at dinner time, giving meaningful, sad, reproachful looks at the food Rohinka had cooked. "
― John Lanchester , Capital