A new puzzle for the evolution of speech?

@article{Abry1998ANP,
  title={A new puzzle for the evolution of speech?},
  author={Christian Abry and Louis-Jean Bo{\"e} and Rafael Laboissi{\`e}re and Jean-Luc Schwartz},
  journal={Behavioral and Brain Sciences},
  year={1998},
  volume={21},
  pages={512 - 513}
}
We agree with MacNeilage's claim that speech stems from a volitional vocalization pathway between the cingulate and the supplementary motor area (SMA). We add the vocal self- monitoring system as the first recruitment of the Broca-Wernicke circuit. SMA control for “frames” is supported by wrong consonant-vowel recurring utterance aphasia and an imaging study of quasi-reiterant speech. The role of Broca's area is questioned in the emergence of “content,” because a primary motor mapping… 
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COPRODUCTION STRATEGIES IN FRENCH VCVS : CONFRONTING ÖHMAN ' S MODEL WITH ADULT AND DEVELOPMENTAL ARTICULATORY DATA

An anthropomorphic articulatory model of a French speaker is used to investigate compensation strategies in the production of VCVs and backup Öhman’s dual-channel model of coarticulation, and gives further evidence for a dual- channel motor control of speech.