“We slur our words, and it’s harder to maintain the motor coordination and control needed for effective fine motor execution needed for speech production,” explains Amee Shah, director of Cleveland State University’s Research Laboratory in Speech Acoustics & Perception.That's surely part of what's going on. Maybe the Wisconsin linguists working on inebriated speech will comment on that. And maybe Shah will have more to say on this ... the piece is so short that it can't really cover much.
But — assuming that we do become more dialectal when we drink — how much of that is about motor control? I know that when people get really upset, their speech can become much more dialectal. (You know who you are.) That's not motor control. What else is at work? What's worrisome about the way the article presents it is that it really feeds the stereotype that dialect is lazy speech.