Introduction

The Eysenck Personality Questionnaire (EPQ) is a personality assessment tool that evaluates traits such as extraversion-introversion and emotional stability. Developed from several personality surveys, it involves fewer concepts compared to other factor-analytically derived personality questionnaires. With convenient administration and good reliability/validity, it remains one of the most influential psychological scales internationally.

This questionnaire contains 85 questions. Answer them sequentially without overthinking - respond "Yes" if the statement applies to you, otherwise "No". Answer based on your actual situation rather than guessing what might be "correct". There are no right/wrong answers or trick questions. Respond promptly after understanding each question without prolonged deliberation. While there's no time limit, avoid unnecessary delays or answering without comprehension.

Scale Structure

The EPQ consists of four scales (ENPL) measuring three core personality dimensions: Extraversion-Introversion, Neuroticism (emotional stability), and Psychoticism.

1. E Scale (Extraversion): Originally proposed by Jung from a psychodynamic perspective using libido orientation. Eysenck classified it based on laboratory/clinical findings, relating it to CNS excitation/inhibition intensity. Phenomenological descriptions align between both theories.
2. N Scale (Neuroticism): Also termed emotional stability or ego strength. Eysenck associated it with autonomic nervous system stability.
3. P Scale (Psychoticism): Items derived from traits screening across normal and clinical populations. Less mature than E/N scales. Exists in everyone to varying degrees; pronounced levels may indicate behavioral abnormalities.
4. L Scale (Lie): Measures response dissimulation and social desirability bias, also reflecting naivety. While interconnected with other scales, it represents a stable personality function.

Standard Score Interpretation

1. E Scale: Indicates extraversion-introversion. Scores >61.5 = typical extravert; 56.7-61.5 = tendency; 43.3-56.7 = ambivert; 38.5-43.3 = introvert; <38.5 = typical introvert.
2. N Scale: Measures emotional stability. Scores >61.5 = unstable (anxiety, tension, irritability); <56.7 = stable.
3. P Scale: Assesses psychological normality. Scores >61.5 = pronounced psychoticism; 56.7-61.5 = tendency; <56.7 = normal range.
4. L Scale: Scores >60 indicate invalid responses due to high dissimulation.

Dimensional Descriptions

1. Typical Extravert (High E):

Sociable, enjoys gatherings, has many friends, dislikes solitary activities, craves excitement, risk-taking, impulsive, action-oriented. Prefers practical work, quick responses, casual, optimistic, talkative, restless, potentially aggressive. Generally emotionally uncontrolled and less grounded.

2. Typical Introvert (Low E):

Quiet, reserved, introspective, prefers reading to socializing. Conservative, maintains distance (except close friends), plans ahead, cautious, avoids impulsivity. Dislikes excitement, values routine, meticulous. Rarely aggressive, somewhat pessimistic. Reliable. Ethics-guided values.

3. Emotionally Unstable (High N):

Anxious, tense, irritable, often depressed. Sleep disturbances, psychosomatic issues. Overreacts to stimuli with slow recovery. Impaired adaptation. Irrational, potentially dangerous. Combined with extraversion: easily provoked, restless, excitable, aggressive, prejudiced.

4. Emotionally Stable (Low N):

Slow, mild emotional reactions with quick recovery. Typically calm, even anger is controlled and tension-free.

5. High Psychoticism (High P in adults):

Solitary, indifferent. Often troublesome, misfit. Potentially cruel, inhumane, unempathetic. Hostile even to loved ones. Offensive. Enjoys peculiar activities, fearless. Mischievous, disruptive.

6. L Scale:

Measures lying, concealment, or social desirability bias ("faking good"). Higher scores indicate greater response dissimulation and conventionality.