It seems reasonable to me that humans discretize numbers: this number is bigger than than number, or when faced with a series of numbers that range from 0 - 100, 50 is "middling", 10 is "low" and 90 is "high". It doesn't seem to me that the brain would place much value in the difference between 76 or 77.
I ask this in the context of scoring in games: many games present scores to players as numbers, but it seems to me the numbers themselves are meaningless, and actually translate to mental buckets where you can say "this is a good score" or "this is a bad score". Players don't actually perceive the numbers. This would indicate that games that use grading systems like A-F would be better communicators of player performance.
Is there any research to back up this theory? I'm coming up short, but I can't believe no-one has tried to answer this question.