This study speaks for itself - if the brain is using facial movement as a cue, then it seems to make sense that giving the brain access to these cues would make learning the language easier, as the brain would have an easier time recognising words. Reading out loud, and speaking, would elicit these responses.
Here is the review of the study:
Feeling Your Words: Hearing With Your Face
ScienceDaily (Jan. 26, 2009) — The movement of facial… Continue