Please also take in mind that our common talking is also a specific kind of self-talk. We need to hear ourselves to perceive the tau-value of the actual spoken word within a perceptual image of a whole manifest and latent sentence. Think in here about the situation in a telephone conversation when you here a disturbing echo. The echo is disturbing because it diffuses that tau-value which exactly follows the marble within a marble run and in which the final action-perception coupling is disclosed.
Talking is already explained within the explanatory model of all motoric movement actions. The only problem is that it is not put on paper yet. But it exactly follows the motoric movement action writing which can be found under my profile.