Andrea Moro, Professor of General Linguistics at the University School for Advanced Study in Pavia, writes for the MIT Press Reader about an interesting experiment:
At least since the pioneering work of Nobel Prize-winning electrophysiologist Lord Edgar Adrian we have known that no physical signal is ever completely lost when it reaches the brain. What we’ve more recently discovered is surprising: Apparently electric waves preserve the shape of their corresponding sound waves in non-acoustic areas of the brain, such as in the Broca’s area, the part of the brain responsible for speech production.
These findings shed important light on the relationship between sound waves and electric waves in the brain, but almost all of them rely on one aspect of the neuropsychological processes related to language: namely, sound emission decoding. Yet we know that language can also be present in the absence of sound, when we read (as what we are most probably experiencing at this very moment) or when we use words while thinking — in technical terms, when we engage in endophasic activity.
This simple fact immediately raises the following crucial question: What happens to the electric waves in our brain when we generate a linguistic expression without emitting any sound? […]
Remarkably, we found that the shape of the electric waves recorded in a non-acoustic area of the brain when linguistic expressions are being read silently preserves the same structure as those of the mechanical sound waves of air that would have been produced if those words had actually been uttered. The two families of waves where language lives physically are then closely related — so closely in fact that the two overlap independently of the presence of sound. The acoustic information is not implanted later, when a person needs to communicate with someone else; it is part of the code from the beginning, or at least before the production of sound takes place. It also excludes that the sensation of exploiting sound representation while reading or thinking with words is just an illusory artifact based on a remembrance of the overt speech.
The discovery that these two independent families of waves of which language is physically made strictly correlate with each other — even in non-acoustic areas and whether or not the linguistic structures are actually uttered or remain within the mind of an individual — indicates that sound plays a much more central role in language processing than was previously thought. It is as if this unexpected correlation provided us with the missing piece of a “Rosetta stone” in which two known codes — the sound waves and the electric waves generated by sound — could be exploited to decipher a third one: the electric code generated in the absence of sound, which in turn could hopefully lead to the discovery of the “fingerprint” of human language.
Intriguing, certainly, but the MIT imprint inspires a certain skepticism, and I don’t know enough about this stuff to have a sensible opinion. All thoughts, as always, are welcome.
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