Kechari mudra practice is somewhat more complicated and involved than this amygdala stimulation. I guess it's not exactly the same thing, but it sounds similar, and the drawing you posted suggests the same effect, because the yellow band indicates the same area of the body I feel an effect.
As I practice it daily, it seems to be getting easier and easier to remain focussed and not have the impulse to stop. I will accept this a a good sign.
