Top 10 travel destinations in us on g., predators, intruders, enemy forces in combat). It demands maximum physiological and psychological attention and an ability to attend and respond to stimulus changes for uninterrupted periods of time, which can produce significant cognitive stress and occasional physiological stress reactions. vigilant adj. violation-of-expectation method a technique, based on habituation and dishabituation procedures, in which increases in an infant’s looking time are interpreted as evidence that the outcome expected by the infant has not occurred. violence n. the expression of hostility and rage with the intent to injure or damage people or property through physical force. Top 10 travel destinations in us 2016.