Three days I have slogged, trying to figure out the answer to a very simple question:
How many times do you need to hear a new word accompanied by its referent before you can consistently pick out the referent, given the wordform?
It turns out that this depends on: similarity between referents, similarity between wordforms, and many other task-based factors. If I had more zeal I would propose a review article, if only to justify the slog time.