Attention Spam

I have noticed that some people have difficulty concentrating on one topic of conversation for longer than about 8 seconds, and are continually branching off onto non-related subjects. It's sometimes preceded with "Can I just interrupt?" and you think there might be some informative supplementary data to your mainline stream of thought forthcoming, but in fact it's more likely to be so off-topic as to make you wonder if you're so boring that any other topic would be a relief to the ears. Other times the off-topic is not preceded by any introduction but just hurls you into a parallel universe. I call this little nugget of observed behavior "attention spam".