hi April, the clear result of having an enhanced listening thru dictation is when you have written a summary of what has been dictated (this is of course the way of measuring if you have listened attentively or not - as what the reporters do). Andrew's suggestion is good. you can also try watching some interviews and write down the significant words or phrases that caught your attention best (not the word-by-word phrases or else you might loose the entire topic). then, try reporting what you've written to someone else and observe if they have understood you in the same manner as the original interview went. :)

find some audio recordings on line and practice writing down what they are saying. You may need to pause it a lot as writing is much slower than speaking even for native english speakers. Cheers, Andrew