Abnormal psychology focuses on abnormal behavior, its definition,  classifications, explanations, and treatment (Hansell & Damour,  2008).  Although its history is merely 100 years old, its story is  richly textured.  During its evolution, decisions regarding areas of  focus evolved into six core concepts that enabled a more accurate  definition of the field.  To fully understand the scope and significance  of contemporary abnormal psychology one must consider psychopathology  and its origins, its distinct evolution, and the theoretical models of  abnormality, which, in their diversity, attempt to treat those suffering  from various disorders. 
Origins of Abnormal Psychology 
The relatively young science of abnormal psychology has  existed for approximately one hundred years although many forms of  mental illness have been recorded throughout history.  Stories from  biblical times describe suffering similar to contemporary illnesses such  as depression and schizophrenia (Bark, 1988; Kahn, 1975, as cited by  Hansell & Damour, 2008).  One of the earliest known explanations for  mental illness in primitive cultures was animism, predicated on belief  in the power of the spirit world (Hansell & Damour, 2008).   According to this view, mental affliction was associated with possession  by an evil or hateful spirit.  Archeologists have documented evidence  of a treatment called trephination as early as 3000 BCE.   This medical  procedure consisted of boring holes into the skull to release the  offending spirit (Hansell & Damour, 2008).  Although this treatment  seems archaic and primitive, in a world in which the spirit permeated  life, it seemed a logical way to release the entrapped spirit.   According to historic relativism, this was a normal reaction to a  debilitating problem.  
Challenges  to Defining and Classifying Normal and Abnormal Behavior 
Behavior vacillates on a wide spectrum between expected and  accepted behavior and its abnormal counterpart, and identifying the  point at which behavior deviates from normal and becomes abnormal is  challenging.  According to Hansell and Damour (2008), abnormal behavior  is often an exaggerated normal state with many shades of gray between it  and its normal complement.  Adding further challenge to differentiating  between the two is the changing palette and cultural texture of  humankind as it moves through time.  Relativism, is the notion that  normalcy and abnormality is defined within the relative parameter of the  culture and period in which the behavior transpires.  As such, the  perception of behavior is always changing and relative to the social,  cultural, and historical context surrounding and immediately preceding  the behavior (Alarcon, Foulks, & Vakkur, 1998; Cohen, 1998; Comunian  & Gielen, 2000; Kagitcibasi, 2000; Kim, 2000, as cited by Hansell  & Damour, 2008).  Behavior and thinking  considered pathological in  one place and time is neither abnormal nor unexpected in another culture  and period.  The line of demarcation is somewhat arbitrary (Hansell  & Damour, 2008). 
To facilitate a more accurate definition of  the field, six core concepts were created.  These concepts include the  importance of context, the continuum between normal and abnormal  behavior, attention to cultural and historical relativism, understanding  the benefits and impediments of diagnosis, understanding multiple  causality, and the significance of the mind/body connection.  
The  Evolution of Abnormal Psychology into a Scientific Discipline 
During the course of scientific evolution, in 460 BCE  Hippocrates attributed mental illness to the imbalanced biological state  of four fluids within the human body.  Although flawed, his  explanations were a significant step toward contemporary medical  thinking (Hansell & Damour, 2008).  Early biological theory  influenced other Greek physicians to diagnose according to medical  observations rather than folklore, anecdote, or spiritual belief.  In  the forward movement of the medical field, associations made between  psychological symptoms directly resulting from biological causes  inspired new thinking (Hansell & Damour, 2008). 
Early in the twentieth century, two psychological perspectives emerged:  somatogenic and psychogenic.  The former claimed abnormal behavior had  physiological origins, the latter maintained its causes were  psychological ("Abnormal psychology - new world encyclopedia," n.d.).   The study of hypnotism became a treatment of hysteria, and eventually  attracted Sigmund Freud, who introduced his theory on conflicting  unconscious directives and their powerful influence on behavior and  thought processes (Feist & Feist, 2009).  He eventually associated  hysteria to such unconscious processes ("Abnormal psychology - new world  encyclopedia," n.d.).  Although his ideas had no scientific basis, his  claim was the first comprehensive theory in abnormal psychology (Hansell  & Damour, 2008).  
Theoretical Models Related to the  Development of Abnormal Psychology         
Various  theoretical models emphasize the importance of therapeutic relationships  within the treatment process.  Although these models converge and  intersect, each addresses causality from a different perspective  (Hansell & Damour, 2008).  The psychosocial model addresses how  individuals accommodate internal conflicting conscious and unconscious  processes while interacting with their environment.  It addresses the  affects of such influences on behavior and often focuses on social  relationships, immediate environments, and internal conflicts, concerns,  and memories (Hansell & Damour, 2008). 
The  biological/medical model identifies a biological or physical association  to mental disease and dysfunction.  This model assesses the  contribution of physical and biochemical functions in the human body,  especially within the brain, as a means to understand how these  functions relate to abnormal overt behavior and unobservable deviant  mental processes (Hansell & Damour, 2008).  The sociocultural model  addresses the affects of social, cultural, and familial environments on  individuals and their contribution to mental dysfunction and illness.   This model accounts for the environment as a stressor and pressure,  which exacerbates potential dysfunctions and provokes abnormal behavior.   Sociocultural models focus on the influence of social norms and rules,  communication, cultural influences, and religious beliefs (Comer,  2007). 
Conclusion 
From early animistic  treatment to the high technology of medical science, psychology has  continued to discover and apply new information and treatment as a means  to affect the discomfort and dysfunction of abnormal behavior, and in  its evolution, progressed to a scientific exploration.  The six core  concepts serve as a reminder that abnormal psychology is a science that  aims to influence and assist people, even though studying the disorders  and clarifying diagnoses is an equally essential ingredient (Hansell  & Damour, 2008).  Various theoretical models emphasize the  importance of a broad therapeutic perspective that promotes a more  reasonable and accurate understanding of the mysteries of abnormal  behavior. 
References 
Abnormal psychology - new world  encyclopedia. (n.d.). New World Encyclopedia. Retrieved       May 05,  2011, from http://www.newworldencyclopedia.org/entry/Abnormal_psychology  
Comer, R. J. (2007). Abnormal psychology. New York: Worth. 
Feist,  J., & Feist, G. (2009). Theories of personality (7th ed.). New  York: McGraw Hill. 
Hansell, J., & Damour, L. (2008).  Abnormal psychology (2nd ed.) [PDF]. Hoboken, NJ: Wiley.
 
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