Hmm, he is really working up to something big I can tell.
I wonder how he can classify knowledge as a mental state similar to fear or happiness, it seem to me to be somewhat different. I feel that there is something missing in his connection of emotions to a feeling of knowing.
Emotions and feeling of knowing can both be triggered by external stimulation he argues and so the evidence is presents but I feel that something is not just right about putting the two neural function so close together.
I think that an emotion can overwhelm you but I have never become overwhelmed with a feeling of knowing. I have been excited in my understanding of something, perhaps that is the emotion of it.
I have become lost in the definition of expressing feeling.
Knowledge is a summation of experiences as are your emotions.
I struggle with an imperfect understanding of the topic, and stagger and the broadness of emotions definition.