Variance from a standard behavior can be measured by different psychological states. These may include deviations from the average acting and ideal model, a sense of personal distress and a lack of comfort, a weak daily performance, and a difference from legal conceptions. The deviant behavior of a patient cannot be defined by a single psychological state or a theoretical definition. However, it may roughly be described as a state that makes a person feel stressed and uncomfortable and does not allow acting efficiently on a day-to-day basis. As Feldman states (2013), according to most psychologists, to determine an abnormality, both normal and deviant behavior of a patient must be researched over some time (p. 461).
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Feldman, R. S. (2013). Essentials of understanding psychology. (10e ed.). New York, NY: McGraw-Hill.