Perception
Perception covers both alertness and comprehension. It determines not only how well a character notices the world around him, but also how well he interprets what he sees and hears.
Trait Effects: Someone with Perception 1 is always inattentive and distracted. Someone with Perception 3 keeps careful track of what's going on around him and almost always notices pickpockets. Someone with Perception 5 can walk through a masked ball and identify everyone he knows solely by their body language.
Characters with Intelligence or Wits scores of 0 are reduced to mindless vegetables. Characters with no dots of Perception are deprived of all senses and cut off from the outside world. Characters reduced to Stamina or Essence 0 have their lives snuffed out. Characters without any Willpower become will-less automatons, similar to what remains after the Fair Folk consume a being's hopes and dreams. In all of these cases, the character can no longer spend experience and has no hope of recovery.