The experiments show that DBN model has the better performance than HMM, and DBN model based on viseme can provide the best mouth shape for talking head.
Active listening is when you are actively engaged, so you might be asking questions; you might be nodding; you might be making listening sounds, uh huh, uh huh, hmm...that's interesting.
Hmm, I've been a bit worried about his reaction. But anyway I'll send him an email to request a meeting, and I'll see what happens from there. Thanks for your advice.