I am terrible at learning languages. Over the years, I’ve struggled to get by with high school French and the bits and pieces of Spanish that I picked up living in South Florida. Before trips, I have crammed traveler’s Greek, Italian, Russian, and even Japanese, but I have never gotten beyond basics. Needless to say, I am in awe of folks who are bilingual or even multilingual. But how do they do it.

Now science may be providing some answers. The article “How do bilingual brains navigate between languages? Scientists discover ‘geometric neural map.’” describes new research just published in Cell, and it begins with the below paragraph:
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“Anyone who speaks more than one language knows the feeling of expressing the same thought through entirely different linguistic lenses. A new study by researchers at Rice University and Baylor College of Medicine reveals that the key to this translation ability is a shared geometric map of neural responses in the hippocampus.”

It also discusses how neuroscience and AI may be converging on similar conclusions or underlying principles. This is fascinating research. However, the research was based on only four speakers of English and Spanish. Still, it leaves many questions to consider.
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– Does the conceptual map somehow exist independent of language, or is it created with the learning of your first language? I would bet on the latter.

– English and Spanish share Indo-European structure and Latin-alphabet orthography. Does the mapping differ if you have completely different phonetics (e.g., Chinese) or very different grammar (e.g., Japanese)? Only one or the other? Both? If so, is there a threshold for “different”?
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– One of the study’s senior authors described the brain as “keeping languages distinct enough to avoid interference.” But that refers to the proposed neural geometry of meaning, not necessarily to every retrieval slip we make while speaking—and multilingual people do mix things up. ​