Vocalization thus unfolded in a sequence, beginning with the most subtle Para stage, progressively becoming less subtle until it manifested from the throat outwards grossly as Vaikhari.
There is fascinating EEG and fMRI research on the physiological changes that happen in the brain prior to the production of speech, which might allow for a fuller exploration of this correspondence. When a subject is shown a picture and asked to name them out loud, lexical selection appears to occur after 200 ms, phonological encoding between 275 and 400 ms, and morphological processing starts after 350 ms.[53] 1‑1.5 seconds before speech is produced, a “readiness” potential is demonstrable on EEG, which is thought to be the time when the decision to speak has been made, which might correlate with motivational processes.[54]
