No matter what tricks we use to help us cope, some horror pushes past the logical centers of our brain and grips us at our basest emotional core. It's a fascinating phenomenom to witness in oneself.
Everyone has their limit in terms of what what they can tolerate in the horror genre. There is only so long that a person can play in a world defined by horror before the atmosphere begins to wear on them. Sometimes, the “creepiness factor” is just turned up passed someone’s personal threshold. For others, it is the type of horror that tests their tolerance. For one who can’t stand the site of blood, shlocky slaughter fests are more than they can, though others may find them fairly tame or even uninteresting. For that matter, for some members of an audience the simple inclusion of spiders may be enough for a movie or game to go unfinished.
It’s odd how much power in the moment that the fictional can have over our physical being. We know what is being represented isn’t real. We know that for a fact. We are holding the controller or mouse & keyboard in our hands. We are looking at a screen with borders. The graphics, no matter how realistic, we can see isn’t like the real world. Yet, there comes a point when a person just has to stop. Their limit has been surpassed. Maybe they stop for good or merely to regain their composure. Interestingly, this is the recognition of this need is a dynamic that Amnesia: The Dark Descent adopts in its design.