Reflexes are involuntary or automatic movements that are often elicited in response to a stimulus. Reflexes can be evoked to various mechanical, visual/vestibular, auditory and other types of stimuli.

The echo of footsteps fleeing down a corridor. A prickling of the skin and a flicker of candlelight. A feeling that something, somehow, just isn’t quite right. You might feel some or all of these ...