Yes, we get bored easily.the direct stare means they are studying the object of interest, gathering data, then they do the quick up right or left stares as they visually process what they are doing w the data. Or the direct stare is the Ti coming out once they have decided what to do with the data. That's me, not nlp, could totally be wrong.
In general though it also passes into conversation, body movements, into everything they do. The potential for "something brewing" is always there. looking for mischief as you noted earlier.
Fi dominant types love when you focus on them and can see into them, perhaps. They get used to not being noticed.For me, having a very similiar Ne, now that I am actually making eye contact (Fi s do hide from others), it is intoxicating, and really fun. I love mischief, although I am more like a puppy wheareas you guys are more like tiger cubs.