Perception Check Modifiers (Apath)

Unofficial rules compendium

Circumstance	Perception modifier
Observer is distracted (busy, in melee)	-5
Observer is asleep	-10
Distance	-1 per 10 ft.
Against an event behind an obstacle (corner, screen)	-5
Against improved cover or behind a closed door Halve this modifier if adjacent to a known door or cover.	-10
Against total concealment (invisible, full cover) Assumes distractions, like a city street or busy room. In a quiet setting or when another sense could reveal the character this modifier is reduced to -10, or even less in an absolute quiet.	-20

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