“When speakers from different language backgrounds work together using a common language, they draw on subconscious concepts that lie below the surface of the language they happen to be conversing in.
For example, in the German mind, the English word “put” conjures up different images: “legen” means to lie horizontally, “setzen” to make something sit, and “stellen” to stand something vertically. Each of these meanings automatically gives the German speaker access to new ways of approaching a practical problem. In this way, using different languages in collaboration may lead to new connections being made, especially when dealing with complex tasks.”
Source: Multilingual people make better employees because their brains are structured differently — Quartz
“Our minds are assaulted by varied sights, sounds, and other external sensory inputs, plus thoughts and proprioreceptive sensations (which make us aware of the relative positions of our own body parts) (see the figure). To succeed in doing anything at all, we must temporarily inhibit 99% of those inputs and attend to just 1% of them, and the appropriate choice varies with the circumstances. That selective attention involves a set of processes, termed executive function, that reside in the prefrontal cortex and develop especially over the first 5 years of life (9)
[…] As a result, multilinguals have constant unconscious practice in using the executive function system.”
Source: The Benefits of Multilingualism by Jared Diamond | ScienceMag.org