Normally I don't do a lot of talking but when I do (phone conversations with friends can get long!!) I find myself slurring words after a while. Not sure that they notice it - but I do. After a long episode of talking (and thinking) I find simple, everyday words hard to come up with. Long pauses while I figure out what to say. Most of the friends I have lengthy conversations with have MS so they probably don't even notice it - or if they do they don't mention it.