Quote:
Originally Posted by whswhs
But there are different ways to get a good perception roll. You can have a sense with high bandwidth, like the human eye. You can also have a brain that's good at processing information and extracting meaning from sense data.
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While this is a realistic distinction to make (20:20 vision with Per 10 and 20:40 vision with Per 12 should be distinguishable), it's really not one GURPS normally chooses to make: either something is impossible, or it's got a difficulty modifier, and if it has a difficulty modifier, all you need is more plusses. Distinguishing people by scent is something humans can do, just extremely unreliably, so it's a difficulty modifier.