What's the matter with ja?
When I first met the man who'd later become my husband, I thought he had a tic or some little quirk with his speech. Of course by us just talking online and then Skype, I never caught on until I met him in person. That's when I thought he had a speech abnormality, tic, or something, but I didn't want to bring it up for fear of hurting his feelings. Anytime I'd say something, he'd inhale "yeah" in agreement with me. As it turns out, he just has a case of Norwegian-itis. The next time we met, he did this less, so I assumed he was just less nervous this time. I didn't notice it again until after I moved to Norway and it returned. Except this time every Norwegian did it! This is actually an ingressive sound Scandinavians make in which they inhale when they say "ja" sometimes. In some way it sounds as if they are startled or scared and gasp when saying "ja." Here is a Youtube video I found where you can listen to the ingressive ...