--- title: "Eysenck Personality Questionnaire | Intro Psych" description: "Eysenck Personality Questionnaire is a self-report personality test measuring extraversion, neuroticism, and psychoticism in Intro to Psychology." canonical: "https://fiveable.me/intro-psychology/key-terms/eysenck-personality-questionnaire" type: "key-term" subject: "Intro to Psychology" unit: "Unit 11" --- # Eysenck Personality Questionnaire | Intro Psych ## Definition The Eysenck Personality Questionnaire (EPQ) is a self-report personality inventory in Intro to Psychology that measures extraversion, neuroticism, and psychoticism. ## What It Is The Eysenck Personality Questionnaire, or EPQ, is a self-report personality inventory used in Intro to Psychology to measure three personality dimensions: extraversion, neuroticism, and psychoticism. It comes from Hans Eysenck’s trait theory, which treats personality as something you can describe with stable, measurable patterns. If you see the EPQ in class, the big idea is that it turns personality into scores on a questionnaire instead of a vague impression. You answer items about how you usually think, feel, and act, and the responses are grouped into trait scales. That makes it a useful research tool because it lets psychologists compare people in a standardized way. Extraversion on the EPQ tracks sociability, assertiveness, and a tendency toward positive emotion. Someone higher in extraversion may prefer group settings, talk easily, and seek stimulation. Neuroticism measures emotional instability, so higher scores are linked with worry, mood swings, and stronger negative emotional reactions. Psychoticism is the most unfamiliar scale for many intro psych students. In Eysenck’s model, it does not mean having psychosis. Instead, it refers to traits such as impulsivity, aggressiveness, tough-mindedness, and lower empathy. That wording can be confusing, so in class it usually comes up as a trait label, not a clinical diagnosis. The EPQ matters because it reflects a biological view of personality. Eysenck argued that traits are influenced partly by genetics and brain-based differences, not just life experience. So when you study the EPQ, you are also studying how psychologists try to measure personality traits and how trait theories explain behavior differently from approaches like psychodynamic theory. ## Why It Matters The EPQ shows up whenever Intro to Psychology turns from abstract personality ideas to measurement. Instead of just saying that people differ, this questionnaire gives a way to describe those differences with scores, which is exactly what trait theorists want. It also helps you separate personality traits from mental disorders. The psychoticism scale sounds clinical, but in Eysenck’s model it is about impulsive, cold, or aggressive behavior patterns, not a diagnosis. That distinction is easy to miss on quizzes and in class discussion. The EPQ connects directly to broader personality questions, like whether traits are inherited, how stable they are over time, and how researchers compare one theory to another. If you are reading a case study, a research summary, or a multiple-choice item about a personality inventory, the EPQ tells you what kind of evidence the psychologist is gathering and what trait model they are using. ## Connections ### Trait Theory The EPQ is built on trait theory, which says personality can be described using stable characteristics that differ from person to person. Instead of explaining the deep causes of behavior, trait theory focuses on measuring consistent patterns. The EPQ is one example of how psychologists turn that idea into a questionnaire. ### Extraversion Extraversion is one of the EPQ’s main scales, so questions about sociability, talkativeness, and stimulation-seeking often point to this trait. In a scenario, a person who likes crowds, action, and social interaction would likely score higher here. It is one of the easiest EPQ traits to recognize in real-life examples. ### Neuroticism Neuroticism measures emotional reactivity, especially anxiety, worry, and mood instability. On the EPQ, higher scores suggest that a person reacts more strongly to stress or negative events. This makes it useful for comparing how people handle pressure in everyday situations, like exams, conflict, or uncertainty. ### [Hans Eysenck](/intro-psychology/key-terms/hans-eysenck) Hans Eysenck created the EPQ and used it to support his broader personality theory. If a question asks why the questionnaire matters, his name is usually part of the answer because the test reflects his belief that personality traits can be organized into a small number of measurable dimensions. His work shaped trait research in Intro Psych. ## On the AP Exam A quiz question might give you a short description of someone’s behavior and ask which EPQ trait fits best. You would match sociability and outgoing behavior to extraversion, emotional reactivity to neuroticism, and impulsive or aggressive behavior to psychoticism. In a short response, you might also explain that the EPQ is a self-report inventory, so the person reports on their own behavior rather than being observed by a clinician. If the item asks about Eysenck’s theory more broadly, connect the questionnaire to his idea that personality traits are measurable and partly biological. That is the move teachers want you to make: identify the scale, connect it to a trait, and avoid treating psychoticism like a diagnosis. ## Eysenck Personality Questionnaire vs Big Five Personality Traits The EPQ and the Big Five are both trait models, but they do not organize personality the same way. The EPQ focuses on extraversion, neuroticism, and psychoticism, while the Big Five adds openness to experience, agreeableness, and conscientiousness. If a question lists five broad traits, it is not the EPQ. ## Key Takeaways - The Eysenck Personality Questionnaire is a self-report inventory that measures personality using three main scales: extraversion, neuroticism, and psychoticism. - In Intro to Psychology, the EPQ is tied to Hans Eysenck’s trait theory, which treats personality as something stable and measurable. - Psychoticism on the EPQ does not mean psychosis or a psychotic disorder, it refers to traits like impulsivity, aggression, and low empathy. - The questionnaire matters because it gives psychologists a way to compare people using the same trait framework instead of relying on casual judgment. - When you see the EPQ in a scenario, look for behavior clues and match them to the correct trait scale. ## FAQs ### What is the Eysenck Personality Questionnaire in Intro to Psychology? It is a self-report personality test developed by Hans Eysenck. The EPQ measures three trait dimensions: extraversion, neuroticism, and psychoticism. In Intro Psych, it comes up as part of trait theory and personality measurement. ### What traits does the EPQ measure? The EPQ measures extraversion, neuroticism, and psychoticism. Extraversion is linked to sociability and positive emotion, neuroticism to emotional instability, and psychoticism to impulsivity, aggression, and low empathy. Those are the main labels to know for class questions. ### Is psychoticism the same as psychosis? No, and that is a common mix-up. In Eysenck’s model, psychoticism is a personality trait dimension, not a mental illness diagnosis. It refers to tendencies like impulsivity, aggressiveness, and tough-mindedness. ### How would the EPQ be used in a psychology class? You might use it to identify traits in a case description, compare it with other personality models, or explain how self-report inventories measure personality. It also shows up in research discussions about whether traits are influenced by biology and genetics. ## Related Study Guides - [11.7 Trait Theorists](/intro-psychology/unit-11/7-trait-theorists/study-guide/qcUf7Xbat2t1mcVL) ## About This Document Canonical Fiveable pages are available as Markdown at the same path plus `.md`. - [llms.txt](https://fiveable.me/llms.txt): index of Fiveable's sections and URL patterns - [llms-full.txt](https://fiveable.me/llms-full.txt): complete subject and unit listing - [MCP server](https://fiveable.me/mcp): call Fiveable as tools instead of fetching pages (`https://fiveable.me/api/mcp`) - [MCP server for AP teachers](https://fiveable.me/mcp/teachers): a teacher's classes, assignments and AP-rubric grading (`https://fiveable.me/api/mcp/teacher`) ## Structured Data ```json {"@context":"https://schema.org","@graph":[{"@type":"LearningResource","@id":"https://fiveable.me/intro-psychology/key-terms/eysenck-personality-questionnaire#resource","name":"Eysenck Personality Questionnaire | Intro Psych","url":"https://fiveable.me/intro-psychology/key-terms/eysenck-personality-questionnaire","learningResourceType":"Concept explainer","educationalLevel":"AP® / High School","about":{"@id":"https://fiveable.me/intro-psychology/key-terms/eysenck-personality-questionnaire#term"},"audience":{"@type":"EducationalAudience","educationalRole":"student"},"dateModified":"2026-07-03T02:22:12.771Z","isPartOf":{"@type":"Collection","name":"Intro to Psychology Key Terms","url":"https://fiveable.me/intro-psychology/key-terms"},"author":{"@type":"Organization","@id":"https://fiveable.me/editorial#content-team","name":"Fiveable Content Team","url":"https://fiveable.me/editorial","parentOrganization":{"@id":"https://fiveable.me/#organization"},"member":[{"@type":"Person","name":"Amanda DoAmaral","sameAs":["https://www.linkedin.com/in/adoamaral"]},{"@type":"Person","name":"Becky Bahr","sameAs":["https://www.linkedin.com/in/becky-bahr-b52743132"]}]},"publisher":{"@type":"Organization","name":"Fiveable","url":"https://fiveable.me"}},{"@type":"DefinedTerm","@id":"https://fiveable.me/intro-psychology/key-terms/eysenck-personality-questionnaire#term","name":"Eysenck Personality Questionnaire","description":"The Eysenck Personality Questionnaire (EPQ) is a self-report personality inventory in Intro to Psychology that measures extraversion, neuroticism, and psychoticism.","url":"https://fiveable.me/intro-psychology/key-terms/eysenck-personality-questionnaire","inDefinedTermSet":{"@type":"DefinedTermSet","name":"Intro to Psychology Key Terms","url":"https://fiveable.me/intro-psychology/key-terms"}},{"@type":"FAQPage","mainEntity":[{"@type":"Question","name":"What is the Eysenck Personality Questionnaire in Intro to Psychology?","acceptedAnswer":{"@type":"Answer","text":"It is a self-report personality test developed by Hans Eysenck. 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