I think it's part of the disorder. I struggle quite often with word or even complete sentence loss, sometimes worse than other times. The more you think about it, the worse it gets!
Then there are times, not as often, where I can rattle off any word in my entire vocabulary with great articulation for hours!
I'm either articulate to the point where I feel like I can sit down and write a novel, or I can barely write a simple note with out making any sense at all!
Dull or sharp. And not often enough, somewhere in between..
One therapist thought I had severe add, but I think its more that BP overlaps with a lot of other disorders. I can be in an a conversation, important or not and if something shiny catches my eye, or an intusive thought that can take me to another planet, forget about it. I stop talking or listening and can't remember where I left off
Coffee in moderation helps me, but it's not for everyone. Too much and I'm worse..