Although their general goals are similar to those of other scientific professionals, clinical scientists and practitioners face problems that make their work especially difficult. One of the most troubling is that psychological abnormality is very hard to define. Consider once again Johanne and Alberto. Why are we so ready to call their responses abnormal?

While many definitions of abnormality have been proposed over the years, none has won total acceptance (Bergner & Bunford, 2014). Still, most of the definitions have certain features in common, often called “the four Ds”: deviance, distress, dysfunction, and danger. That is, patterns of psychological abnormality are typically deviant (different, extreme, unusual, perhaps even bizarre), distressing (unpleasant and upsetting to the person), dysfunctional (interfering with the person’s ability to conduct daily activities in a constructive way), and possibly dangerous. This definition offers a useful starting point from which to explore the phenomena of psychological abnormality. As you will see, however, it has limitations.

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Abnormal psychological functioning is deviant, but deviant from what? Johanne’s and Alberto’s behaviors, thoughts, and emotions are different from those that are considered normal in our place and time. We do not expect people to cry themselves to sleep each night, hate the world, wish themselves dead, or obey voices that no one else hears.

In short, abnormal behavior, thoughts, and emotions are those that differ markedly from a society’s ideas about proper functioning. Each society establishes norms—stated and unstated rules for proper conduct. Behavior that breaks legal norms is considered to be criminal. Behavior, thoughts, and emotions that break norms of psychological functioning are called abnormal.

Judgments of abnormality vary from society to society. A society’s norms grow from its particular culture—its history, values, institutions, habits, skills, technology, and arts. A society that values competition and assertiveness may accept aggressive behavior, whereas one that emphasizes cooperation and gentleness may consider aggressive behavior unacceptable and even abnormal. A society’s values may also change over time, causing its views of what is psychologically abnormal to change as well. In Western society, for example, a woman seeking the power of running a major corporation or indeed of leading the country would have been considered inappropriate and even delusional a hundred years ago. Today the same behavior is valued.

Judgments of abnormality depend on specific circumstances as well as on cultural norms. What if, for example, we were to learn that Johanne is a citizen of Haiti and that her desperate unhappiness began in the days, weeks, and months following the massive earthquake that struck her country, already the poorest country in the Western hemisphere, on January 12, 2010? The quake, one of the worst natural disasters in history, killed 250,000 Haitians and left 1.5 million homeless. Half of Haiti’s homes and buildings were immediately turned into rubble, and its electricity and other forms of power disappeared. Tent cities replaced homes for most people (Granitz, 2014; Wilkinson, 2011).

In the weeks and months that followed the earthquake, Johanne came to accept that she wouldn’t get all of the help she needed and that she might never again see the friends and neighbors who had once given her life so much meaning. As she and her daughters moved from one temporary tent or hut to another throughout the country, always at risk of developing serious diseases, she gradually gave up all hope that her life would ever return to normal. In this light, Johanne’s reactions do not seem quite so inappropriate. If anything is abnormal here, it is her situation. Many human experiences produce intense reactions—financial ruin, large-scale catastrophes and disasters, rape, child abuse, war, terminal illness, chronic pain (Janssen et al., 2015). Is there an “appropriate” way to react to such things? Should we ever call reactions to such experiences abnormal?

Even functioning that is considered unusual does not necessarily qualify as abnormal. According to many clinical theorists, behavior, ideas, or emotions usually have to cause distress before they can be labeled abnormal. Consider the Ice Breakers, a group of people in Michigan who go swimming in lakes throughout the state every weekend from November through February. The colder the weather, the better they like it. One man, a member of the group for 17 years, says he loves the challenge of human against nature. A 37-year-old lawyer believes that the weekly shock is good for her health. “It cleanses me,” she says. “It perks me up and gives me strength.”

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Certainly these people are different from most of us, but is their behavior abnormal? Far from experiencing distress, they feel energized and challenged. Their positive feelings must cause us to hesitate before we decide that they are functioning abnormally.

Should we conclude, then, that feelings of distress must always be present before a person’s functioning can be considered abnormal? Not necessarily. Some people who function abnormally maintain a positive frame of mind. Consider once again Alberto, the young man who hears mysterious voices. What if he enjoyed listening to the voices, felt honored to be chosen, loved sending out warnings on the Internet, and looked forward to saving the world? Shouldn’t we still regard his functioning as abnormal?

Abnormal behavior tends to be dysfunctional; that is, it interferes with daily functioning (Bergner & Bunford, 2014). It so upsets, distracts, or confuses people that they cannot care for themselves properly, participate in ordinary social interactions, or work productively. Alberto, for example, has quit his job, left his family, and prepared to withdraw from the productive life he once led. Because our society holds that it is important to carry out daily activities in an effective manner, Alberto’s behavior is likely to be regarded as abnormal and undesirable. In contrast, the Ice Breakers, who continue to perform well in their jobs and enjoy fulfilling relationships, would probably be considered simply unusual.

Perhaps the ultimate in psychological dysfunctioning is behavior that becomes dangerous to oneself or others. Individuals whose behavior is consistently careless, hostile, or confused may be placing themselves or those around them at risk. Alberto, for example, seems to be endangering both himself, with his diet, and others, with his buildup of arms and ammunition.

Although danger is often cited as a feature of abnormal psychological functioning, research suggests that it is actually the exception rather than the rule (Stuber et al., 2014). Most people struggling with anxiety, depression, and even bizarre thinking pose no immediate danger to themselves or to anyone else.

Efforts to define psychological abnormality typically raise as many questions as they answer. Ultimately, a society selects general criteria for defining abnormality and then uses those criteria to judge particular cases. One clinical theorist, Thomas Szasz (1920–2012), placed such emphasis on society’s role that he found the whole concept of mental illness to be invalid, a myth of sorts (Szasz, 2011, 1963, 1960). According to Szasz, the deviations that society calls abnormal are simply “problems in living,” not signs of something wrong within the person.

Even if we assume that psychological abnormality is a valid concept and that it can indeed be defined, we may be unable to apply our definition consistently. If a behavior—excessive use of alcohol among college students, say—is familiar enough, the society may fail to recognize that it is deviant, distressful, dysfunctional, and dangerous. Thousands of college students throughout the United States are so dependent on alcohol that it interferes with their personal and academic lives, causes them great discomfort, jeopardizes their health, and often endangers them and the people around them (Merrill et al., 2014). Yet their problem often goes unnoticed and undiagnosed. Alcohol is so much a part of the college subculture that it is easy to overlook drinking behavior that has become abnormal.

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Conversely, a society may have trouble separating an abnormality that requires intervention from an eccentricity, an unusual pattern with which others have no right to interfere. From time to time we see or hear about people who behave in ways we consider strange, such as a man who lives alone with two dozen cats and rarely talks to other people. The behavior of such people is deviant, and it may well be distressful and dysfunctional, yet many professionals think of it as eccentric rather than abnormal (see PsychWatch below).

In short, while we may agree to define psychological abnormalities as patterns of functioning that are deviant, distressful, dysfunctional, and sometimes dangerous, we should be clear that these criteria are often vague and subjective. In turn, few of the current categories of abnormality that you will meet in this book are as clear-cut as they may seem, and most continue to be debated by clinicians.