Discussions are fundamental to shared learning, so please be sure to participate early and often! After you have completed the Reading, and without reviewing your classmates responses, post your initial response to the following Discussion. Your post should be at least 400450 words in length and should extend the discussion of the group supported by your course materials and/or other appropriate resources.Introduction to Abnormal BehaviorPsychologists agree that mental disorders are serious debilitating illnesses that affect the brain and ones ability to function daily. However, defining the term mental illness has its challenges. The psychology field has multiple definitions of the term mental illness, but psychologists tend to agree that mental illness affects a persons thinking (cognition), behavior and emotional state. According to the Diagnostic Statistical Manual-5 (DSM-5; 2013), mental illness is defined by the four criteria.According to Durand and Barlow (2013), psychological disorder is a dysfunction associated with distress or impairment in functioning that is not atypical or a culturally expected response. However, defining and differentiating abnormal behavior from that of normal behavior can present some difficulties. For instance, consider that depending upon a societys mores and norms, what is considered normal in one society may not be considered normal in another. Another example is trying to determine a persons level of dysfunction; it can include not functioning normally in one or more areas such as cognition, emotion, and behavior. The individual who cries a lot or the teenager that binge eats may be showing emotional dysfunction. The individual must be showing personal distress for the behavior to be considered abnormal as well; yet, how should a persons level of distress be identified?References:American Psychiatric Association. (2013). (5th ed.). Arlington, VA: American Psychiatric Publishing.Durand, M. V., & Barlow, D. H. (2013). . (6th ed.). Mason, OH: Thomson Wadsworth.Maschio, J. (2014). . [Video]. Unpublished. http://extmedia.kaplan.edu/artsSCi/PS440-1404A/Unit02DB/Unit02DB.htmlThe strongest answer will refer to the textbook and concepts from the Reading material.