The harmful dysfunction model draws a parallel between psychological and physical illnesses. It posits that just as the symptoms of a physical illness are manifestations of dysfunctions in biological processes, the symptoms of psychological disorders are presumed to reflect dysfunctions in underlying mental processes.

Comparison of Psychological and Physical Illness Symptoms in the Harmful Dysfunction Model

A significant appeal of the harmful dysfunction model is its compatibility with modern neurobiological perspectives on mental illness. The model's focus on the breakdown of internal mechanisms suggests that psychological disorders may stem from failures in biological functions that regulate psychological processes, thereby aligning with and supporting contemporary neurobiological research.

Neurobiological Support for the Harmful Dysfunction Model

The American Psychiatric Association (APA) provides a formal definition of a psychological disorder that incorporates many features from Wakefield's harmful dysfunction model. This definition states that a psychological disorder is a condition involving: 1) significant disturbances in thoughts, feelings, and behaviors; 2) these disturbances reflect an underlying biological, psychological, or developmental dysfunction; 3) they cause significant distress or disability in an individual's life; and 4) they are not expected or culturally approved responses to life events.

American Psychiatric Association (APA) Definition of a Psychological Disorder

Proposed by Wakefield in 1992, the influential harmful dysfunction model defines a psychological disorder using two criteria. First, there must be a 'dysfunction,' which is a failure of an evolutionarily developed internal mechanism (such as cognition or perception) to perform its natural function. Second, this dysfunction must be 'harmful,' meaning it results in negative consequences for the individual or others, as judged by the standards of their culture. These harms can include significant internal distress or impairment in social or occupational life.

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To determine if a psychological disorder is present, mental health professionals must agree on which inner experiences and behaviors are truly symptomatic. While characteristics such as being atypical or violating social norms can serve as indicators, it is widely recognized that neither criterion is sufficient on its own to define a disorder. Therefore, more comprehensive frameworks, like the harmful dysfunction model, are utilized to conceptualize these conditions and form the basis for formal diagnostic criteria.

Criteria for Defining Psychological Disorders

Within Wakefield's model, natural internal mechanisms refer to psychological processes that have been shaped by evolution to serve important functions. These mechanisms include core processes like cognition, perception, and learning, which enable adaptive behaviors such as rational thought, problem-solving, and communication.

Natural Internal Mechanisms in Psychology

Despite numerous efforts, no single, universally accepted definition for psychological disorders exists. This is because no single approach or set of criteria can adequately distinguish all cases of disorder from non-disorder, and there is no universal agreement on the precise boundary between what is considered disordered and what is not. This conceptual challenge highlights the complexity of defining mental illness.

Lack of a Universal Definition for Psychological Disorders

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

OpenStax Psychology (2nd ed.) Textbook

Psychopathology refers to either the study or manifestation of psychological disorders. 

Psychopathology

There are several different ways a human can experience, perceive, and reflect on life. A big job for a psychologist is to determine what is a temporarily abnormality in mental health compared to a more permanent psychological disorder.

Controversy Over Defining Psychological Disorders

A key challenge for psychologists is differentiating true psychological disorders from behaviors and inner experiences that are merely situational, idiosyncratic, or part of the normal range of human experience. For instance, nearly everyone experiences anxiety, unwanted thoughts, and moments of sadness from time to time, and may behave in ways that don't make sense to themselves or others. These common experiences do not typically signify a psychological disorder.

Distinguishing Psychological Disorders from Normal Experiences

Atypicality, or deviating from the norm, is a common sign used to identify a potential psychological disorder. However, this criterion must be used with caution, as a statistically uncommon behavior or characteristic is not necessarily disordered or pathological. Furthermore, some psychological disorders are surprisingly common and not as atypical as one might assume.

Atypicality as an Indicator of a Psychological Disorder

While violating cultural expectations and social norms can be an indicator of a psychological disorder, this criterion is insufficient on its own. Because behaviors and social rules vary significantly across cultures, what is considered appropriate in one society may be viewed as abnormal in another. For example, actions like making direct eye contact or responding to a stranger's smile can be interpreted as respectful in one culture but rude or aggressive in another. Therefore, cultural context is essential when evaluating whether a behavior's deviation from social norms suggests a psychological disorder.

Violation of Social Norms as an Indicator of a Psychological Disorder

Wakefield's Harmful Dysfunction Model

Analyze the following scenario and explain why it presents a complex challenge for determining if a psychological disorder is present. In your analysis, identify the factors that would support a diagnosis and the factors that would argue against it.

Diagnostic Complexity

Read the following scenario. Identify the primary natural internal mechanism that is failing to perform its expected function and explain your reasoning.

Analysis of a Core Psychological Process

A research team proposes that a psychological disorder can be universally defined as 'any pattern of inner experience or behavior that is statistically rare.' Which of the following statements represents the most significant conceptual flaw in this definition?

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