[Article updated on 21 August 2015.]

The study of human personality or ‘character’ (from the Greek charaktêr, the mark impressed upon a coin) dates back at least to antiquity. In his Characters, Tyrtamus (371-287 bc)—nicknamed Theophrastus or ‘divinely speaking’ by his contemporary Aristotle— divided the people of the Athens of the 4th century BC into thirty different personality types, including 'arrogance', 'irony', and 'boastfulness'.

The Characters exerted a strong influence on subsequent studies of human personality such as those of Thomas Overbury (1581-1613) in England and Jean de la Bruyère (1645-1696) in France. 

The concept of personality disorder itself is much more recent and tentatively dates back to psychiatrist Philippe Pinel’s 1801 description of manie sans délire, a condition which he characterized as outbursts of rage and violence (manie) in the absence of any symp- toms of psychosis such as delusions and hallucinations (délires). 

Across the English Channel, physician JC Prichard (1786-1848) coined the term ‘moral insanity’ in 1835 to refer to a larger group of people characterized by ‘morbid perversion of the natural feelings, affections, inclinations, temper, habits, moral dispositions and natural impulses’, but the term, probably considered too broad and non-specific, soon fell into disuse.

Some 60 years later, in 1896, psychiatrist Emil Kraepelin (1856-1926) described seven forms of antisocial behaviour under the umbrella of ‘psychopathic personality’, a term later broadened by Kraepelin’s younger colleague Kurt Schneider (1887-1967) to include those who ‘suffer from their abnormality’.

Schneider’s seminal volume of 1923, Die psychopathischen Persönlichkeiten (Psychopathic Personalities), still forms the basis of current classifications of personality disorders such as that contained in the influential American classification of mental disorders, the Diagnostic and Statistical Manual of Mental Disorders 5th Revision (DSM-5).

According to DSM-5, a personality disorder can be diagnosed if there are significant impairments in self and interpersonal functioning together with one or more pathological personality traits. In addition, these features must be (1) relatively stable across time and consistent across situations, (2) not better understood as normative for the individual’s developmental stage or socio-cultural environment, and (3) not solely due to the direct effects of a substance or general medical condition.  

DSM-5 lists ten personality disorders, and allocates each to one of three groups or ‘clusters’: A, B, or C  

Cluster A (Odd, bizarre, eccentric)

Paranoid PD, Schizoid PD, Schizotypal PD

Cluster B (Dramatic, erratic)

Antisocial PD, Borderline PD, Histrionic PD, Narcissistic PD

Cluster C (Anxious, fearful)

Avoidant PD, Dependent PD, Obsessive-compulsive PD

Before going on to characterize these ten personality disorders, it should be emphasized that they are more the product of historical observation than of scientific study, and thus that they are rather vague and imprecise constructs. As a result, they rarely present in their classic ‘textbook’ form, but instead tend to blur into one another. Their division into three clusters in DSM-5 is intended to reflect this tendency, with any given personality disorder most likely to blur with other personality disorders within its cluster. For instance, in cluster A, paranoid personality is most likely to blur with schizoid personality disorder and schizotypal personality disorder.

The majority of people with a personality disorder never come into contact with mental health services, and those who do usually do so in the context of another mental disorder or at a time of crisis, commonly after self-harming or breaking the law. Nevertheless, personality disorders are important to health professionals because they predispose to mental disorder, and affect the presentation and management of existing mental disorder. They also result in considerable distress and impairment, and so may need to be treated ‘in their own right’. Whether this ought to be the remit of the health professions is a matter of debate and controversy, especially with regard to those personality disorders which predispose to criminal activity, and which are often treated with the primary purpose of preventing crime. 

1. Paranoid personality disorder

Cluster A comprises paranoid, schizoid, and schizotypal personality disorders. Paranoid personality disorder is characterized by a pervasive distrust of others, including even friends, family, and partner. As a result, the person is guarded and suspicious, and constantly on the lookout for clues or suggestions to validate his fears. He also has a strong sense of personal rights: he is overly sensitive to setbacks and rebuffs, easily feels shame and humiliation, and persistently bears grudges. Unsurprisingly, he tends to withdraw from others and to struggle with building close relationships. The principal ego defence in paranoid PD is projection, which involves attributing one’s unacceptable thoughts and feelings to other people. A large long-term twin study found that paranoid PD is modestly heritable, and that it shares a portion of its genetic and environmental risk factors with schizoid PD and schizotypal PD. 

2. Schizoid personality disorder

The term ‘schizoid’ designates a natural tendency to direct attention toward one’s inner life and away from the external world. A person with schizoid PD is detached and aloof and prone to introspection and fantasy. He has no desire for social or sexual relationships, is indifferent to others and to social norms and conventions, and lacks emotional response. A competing theory about people with schizoid PD is that they are in fact highly sensitive with a rich inner life: they experience a deep longing for intimacy but find initiating and maintaining close relationships too difficult or distressing, and so retreat into their inner world. People with schizoid PD rarely present to medical attention because, despite their reluctance to form close relationships, they are generally well functioning, and quite untroubled by their apparent oddness. 

3. Schizotypal disorder

Schizotypal PD is characterized by oddities of appearance, behaviour, and speech, unusual perceptual experiences, and anomalies of thinking similar to those seen in schizophrenia. These latter can include odd beliefs, magical thinking (for instance, thinking that speaking of the devil can make him appear), suspiciousness, and obsessive ruminations. People with schizotypal PD often fear social interaction and think of others as harmful. This may lead them to develop so-called ideas of reference, that is, beliefs or intuitions that events and happenings are somehow related to them. So whereas people with schizotypal PD and people with schizoid PD both avoid social interaction, with the former it is because they fear others, whereas with the latter it is because they have no desire to interact with others or find interacting with others too difficult. People with schizotypal PD have a higher than average probability of developing schizophrenia, and the condition used to be called ‘latent schizophrenia’. 

4. Antisocial personality disorder

Cluster B comprises antisocial, borderline, histrionic, and narcis- sistic personality disorders. Until psychiatrist Kurt Schneider (1887-1967) broadened the concept of personality disorder to include those who ‘suffer from their abnormality’, personality disorder was more or less synonymous with antisocial personality disorder. Antisocial PD is much more common in men than in women, and is characterized by a callous unconcern for the feelings of others. The person disregards social rules and obligations, is irritable and aggressive, acts impulsively, lacks guilt, and fails to learn from experience. In many cases, he has no difficulty finding relationships—and can even appear superficially charming (the so-called ‘charming psychopath’)—but these relationships are usually fiery, turbulent, and short-lived. As antisocial PD is the mental disorder most closely correlated with crime, he is likely to have a criminal record or a history of being in and out of prison.

5. Borderline personality disorder

In borderline PD (or emotionally unstable PD), the person essentially lacks a sense of self, and, as a result, experiences feelings of emptiness and fears of abandonment. There is a pattern of intense but unstable relationships, emotional instability, outbursts of anger and violence (especially in response to criticism), and impulsive behaviour. Suicidal threats and acts of self-harm are common, for which reason many people with borderline PD frequently come to medical attention. Borderline PD was so called because it was thought to lie on the ‘borderline’ between neurotic (anxiety) disorders and psychotic disorders such as schizophrenia and bipolar disorder. It has been suggested that borderline personality disorder often results from childhood sexual abuse, and that it is more common in women in part because women are more likely to suffer sexual abuse. However, feminists have argued that borderline PD is more common in women because women presenting with angry and promiscuous behaviour tend to be labelled with it, whereas men presenting with similar behaviour tend instead to be labelled with antisocial PD.

6. Histrionic personality disorder

People with histrionic PD lack a sense of self-worth, and depend for their wellbeing on attracting the attention and approval of others. They often seem to be dramatizing or ‘playing a part’ in a bid to be heard and seen. Indeed, ‘histrionic’ derives from the Latin histrionicus, ‘pertaining to the actor’. People with histrionic PD may take great care of their appearance and behave in a manner that is overly charming or inappropriately seductive. As they crave excitement and act on impulse or suggestion, they can place them- selves at risk of accident or exploitation. Their dealings with others often seem insincere or superficial, which, in the longer term, can adversely impact on their social and romantic relationships. This is especially distressing to them, as they are sensitive to criticism and rejection, and react badly to loss or failure. A vicious circle may take hold in which the more rejected they feel, the more histrionic they become; and the more histrionic they become, the more rejected they feel. It can be argued that a vicious circle of some kind is at the heart of every personality disorder, and, indeed, every mental disorder. 

7. Narcissistic personality disorder

In narcissistic PD, the person has an extreme feeling of self-importance, a sense of entitlement, and a need to be admired. He is envious of others and expects them to be the same of him. He lacks empathy and readily exploits others to achieve his aims. To others, he may seem self-absorbed, controlling, intolerant, selfish, or insensitive. If he feels obstructed or ridiculed, he can fly into a fit of destructive anger and revenge. Such a reaction is sometimes called ‘narcissistic rage’, and can have disastrous consequences for all those involved. 

8. Avoidant personality disorder

Cluster C comprises avoidant, dependent, and anankastic personality disorders. People with avoidant PD believe that they are socially inept, unappealing, or inferior, and constantly fear being embarrassed, criticized, or rejected. They avoid meeting others unless they are certain of being liked, and are restrained even in their intimate relationships. Avoidant PD is strongly associated with anxiety disorders, and may also be associated with actual or felt rejection by parents or peers in childhood. Research suggests that people with avoidant PD excessively monitor internal reactions, both their own and those of others, which prevents them from engaging naturally or fluently in social situations. A vicious circle takes hold in which the more they monitor their internal reactions, the more inept they feel; and the more inept they feel, the more they monitor their internal reactions. 

9. Dependent personality disorder

Dependent PD is characterized by a lack of self-confidence and an excessive need to be looked after. The person needs a lot of help in making everyday decisions and surrenders important life decisions to the care of others. He greatly fears abandonment and may go through considerable lengths to secure and maintain relationships. A person with dependent PD sees himself as inadequate and helpless, and so surrenders personal responsibility and submits himself to one or more protective others. He imagines that he is at one with these protective other(s), whom he idealizes as com- petent and powerful, and towards whom he behaves in a manner that is ingratiating and self-effacing. People with dependent PD often end up with people with a cluster B personality disorder, who feed on the unconditional high regard in which they are held. Overall, people with dependent PD maintain a naïve and child-like perspective, and have limited insight into themselves and others. This entrenches their dependency, and leaves them vulnerable to abuse and exploitation. 

10. Anankastic personality disorder

Anankastic PD is characterized by excessive preoccupation with details, rules, lists, order, organization, or schedules; perfectionism so extreme that it prevents a task from being completed; and devotion to work and productivity at the expense of leisure and relationships. A person with anankastic PD is typically doubting and cautious, rigid and controlling, humorless, and miserly. His underlying anxiety arises from a perceived lack of control over a world that eludes his understanding; and the more he tries to exert control, the more out of control he feels. In consequence, he has little tolerance for complexity or nuance, and tends to simplify the world by seeing things as either all good or all bad. His relationships with colleagues, friends, and family are often strained by the unreasonable and inflexible demands that he makes upon them. 

Closing remarks

While personality disorders may differ from mental disorders like schizophrenia and bipolar disorder, they do, by definition, lead to significant impairment. They are estimated to affect about 10 per cent of people, although this figure ultimately depends on where clinicians draw the line between a ‘normal’ personality and one that leads to significant impairment. Characterizing the ten personality disorders is difficult, but diagnosing them reliably is even more so. For instance, how far from the norm must personality traits deviate before they can be counted as disordered? How significant is ‘significant impairment’? And how is ‘impairment’ to be defined?

Whatever the answers to these questions, they are bound to include a large part of subjectivity. Personal dislike, prejudice, or a clash of values can all play a part in arriving at a diagnosis of personality disorder, and it has been argued that the diagnosis amounts to little more than a convenient label for undesirables and social deviants.

Adapted from the new second edition of The Meaning of Madness (2015).

Neel Burton is author of The Meaning of MadnessThe Art of Failure: The Anti Self-Help GuideHide and Seek: The Psychology of Self-Deception, Heaven and Hell: The Psychology of the Emotions, and other books.

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