AP® Psychology · Unit 5 · Topic 5.4
Personality Disorders
A personality disorder is an enduring, inflexible pattern of thinking and relating to others that shows up across almost every situation, starts by early adulthood, and causes real distress or impairment — not a rough patch or a prickly personality.
Most disorders are episodes: something starts, causes problems, and can lift. Personality disorders are different because the problem is the character itself. The pattern of perceiving, relating to, and thinking about the world is rigid and baked in, so it plays out the same way at work, at home, with friends, with strangers, year after year, rather than flaring up during one hard season and then resolving.
Clinicians sort the ten personality disorders into three clusters by flavor. Cluster A looks odd or eccentric: paranoid (chronic suspicion), schizoid (detachment, little desire for closeness), schizotypal (eccentric thinking, odd beliefs, discomfort with others). Cluster B looks dramatic, emotional, or erratic: antisocial (disregard for others' rights, deceit), borderline (unstable relationships and self-image, impulsivity), histrionic (attention-seeking, excessive emotionality), narcissistic (grandiosity, need for admiration). Cluster C looks anxious or fearful: avoidant (feelings of inadequacy, fear of rejection), dependent (excessive need to be taken care of), obsessive-compulsive personality disorder (rigid perfectionism and control, distinct from OCD's intrusive thoughts and rituals). Walk through any one of them and the mechanism is the same: a trait that could be mild in small doses becomes so fixed and extreme that it produces conflict in nearly every relationship and setting, not just a tough one.
This topic sits next to the broader category system clinicians use to diagnose disorders, and next to anxiety and mood disorders, which are episodic by contrast. Seeing personality disorders as enduring traits rather than episodes explains why they are typically harder to treat and why treatment aims at managing lifelong patterns rather than curing a discrete episode.
Key terms
- Personality disorder
- An enduring, inflexible pattern of thinking and behaving that pervades many life areas and causes significant distress or impairment.
- Cluster A
- Personality disorders marked by odd or eccentric thinking and behavior, including paranoid, schizoid, and schizotypal.
- Cluster B
- Personality disorders marked by dramatic, emotional, or erratic behavior, including antisocial, borderline, histrionic, and narcissistic.
- Cluster C
- Personality disorders marked by anxious or fearful behavior, including avoidant, dependent, and obsessive-compulsive personality disorder.
- Pervasive pattern
- A way of thinking or behaving that shows up consistently across nearly all situations and relationships, not just one.
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End of topic.