the chart of neuroelectrical impulses made by the muscles that operate the vocal tract
Phonetics is divided readily into two branches, the acoustic and the articulatory. The former having to do with the acoustic features of language sounds and the latter with the production of those. When I was at university, the equipment necessary for making spectrograms was huge and expensive. These days, one can download any of a number of software applications, hook up a microphone to the computer, and make them. In humans, phonetic sounds are made with the vocal tract and processed by the cochlea in in the ear. I have not seen the charts mentioned in the news story linked to above, but I cannot but imagine that they look nothing like spectrograms of the same speech. Now whether the two sets of data could be compared and one identified from the other is within the realm of possibility.
