The bottom line: Declarative, more conscious networks work well (especially in adults) at learning vocabulary and understanding what is to be learned. Procedural networks are responsible for less conscious, more automatic (physiological) processes--such as many aspects of pronunciation, of course. According to Trafton (and many others) the answer is often to avoid "trying harder" by over use of declarative functions. How might that be done? According to Science Daily, again:
" . . . she is now testing the effects of "turning off" the adult prefrontal cortex using a technique called transcranial magnetic stimulation. Other interventions she plans to study include distracting the prefrontal cortex by forcing it to perform other tasks while language is heard, and treating subjects with drugs that impair activity in that brain region."
Got to get me a TMS machine . . .