Eye twitching is causes blepharospasm. There are many causes of eye twitching. The common ones are alcohol, caffeine, fatigue, lack of sleep, physical exertion, smoking, stress, and irritation to the eye or eyelid. Chronic causes include inflamed eyelids, dry eyes, light sensitivity, and pink eye.
Deception involves acting in such a way which leads another person to believe something, that you, yourself, do not believe to be true (see Ekman; Miller & Stiff). The following example helps illustrate this point: Brad and Spencer. Brad and Spencer are both part of the same circle of friends.
One example of deception in psychological research is a 1963 obedience study conducted by the American social psychologist Stanley Milgram. As a Yale University professor, Milgram used deception in a research study when he did not inform participants of the true nature of his study.