Eysenck Personality QuestionnaireRevised (EPQR)

What Is the EPQR?

The Eysenck Personality QuestionnaireRevised (EPQR) is a selfreport inventory created to assess the major dimensions of personality that Hans Eysenck identified as biologically based. First published in the 1970s and later revised, the questionnaire is widely used in research, clinical practice, and educational settings to obtain a reliable profile of an individuals temperament.

Core Dimensions

The EPQR measures four primary scales, each representing a distinct personality trait:

• Extraversion (E) Reflects sociability, liveliness, assertiveness and the tendency to seek stimulation.
• Neuroticism (N) Indicates emotional instability, anxiety, moodiness and susceptibility to stress.
• Psychoticism (P) Relates to aggressiveness, interpersonal hostility, creative imagination and a tendency toward nonconformity.
• Lie Scale (L) Measures the extent to which respondents present themselves in an overly favorable light, helping to detect socially desirable responding.

Extraversion

High scores suggest a person who is talkative, energetic, and enjoys being the center of attention. Low scores indicate introversion, preference for solitude, and a more reflective, calm demeanor.

Neuroticism

People scoring high on Neuroticism experience stronger negative emotions such as worry, irritability, and sadness. Low scorers are generally emotionally stable and resilient.

Psychoticism

This scale is less about clinical psychosis and more about a spectrum ranging from empathy and conformity (low scores) to selfcentrism, impulsivity and unconventional thinking (high scores).

Lie Scale

The Lie scale does not diagnose deception; rather, it flags potential response bias. A markedly high L score suggests the respondent might be answering in a way that portrays them in an overly positive manner.

Structure and Administration

The EPQR consists of 100 forcedchoice items (yes/no or true/false). The items are grouped as follows:

• 48 items for Extraversion
• 48 items for Neuroticism
• 23 items for Psychoticism (some items overlap with the other scales)
• 24 items for the Lie scale (also overlapping)

Because the questionnaire uses a simple binary response format, it can be administered on paper or electronically, and it typically takes 1015 minutes to complete.

Scoring and Interpretation

Scoring is straightforward: each yes or no response is assigned a value of 1 or 0 according to the key for that item. Raw scores are summed for each scale and then converted to standardized scores (Tscores) using normative data that account for age and gender. Below is a simplified guide to interpreting the Tscores:

• 4555 Average range
• 5665 Above average (high)
• 66+ Very high
• 3544 Below average (low)
• 34 Very low

Interpretation should consider the entire profile rather than isolated scores. For example, a high Extraversion combined with high Neuroticism may indicate an emotional extrovert, whereas high Extraversion with low Neuroticism points toward a confident, socially active individual.

Psychometric Properties

Reliability and validity studies have consistently supported the EPQR:

• Reliability: Cronbachs alpha typically exceeds .80 for Extraversion and Neuroticism, and .70.80 for Psychoticism.
• Testretest stability: Correlations of .70.85 over intervals of several weeks to months.
• Construct validity: Strong correlations with other established measures (e.g., NEOPIR, MMPI2) on corresponding traits.
• Predictive validity: EPQR scores have been linked to academic performance, occupational outcomes, healthrelated behaviours, and psychiatric risk.

Applications

The EPQR is used in a variety of contexts:

• Research: Largescale epidemiological studies, personalitygenetics investigations, and crosscultural comparisons.
• Clinical: Screening for anxietyrelated disorders, evaluating personality factors that influence treatment response, and aiding differential diagnosis.
• Educational: Career counselling, student selection, and understanding learning styles.
• Organizational: Personnel selection, teambuilding, and leadership development.

Strengths and Limitations

Strengths

• Brief and easy to administer.
• Strong empirical backing and wide normative data.
• Rooted in a biological model, facilitating integration with neuropsychological research.

Limitations

• Binary response format may reduce nuance compared with Likerttype scales.
• The Psychoticism scale is sometimes criticized for its conceptual overlap with other personality dimensions.
• Cultural differences can affect interpretation; norms are primarily based on Western samples.

Getting the EPQR

The official EPQR is copyrighted and must be purchased from authorized publishers (e.g., Pearson). Many universities hold licensed copies for research. Several openaccess projects provide short forms derived from the EPQR, but they should be used with caution because they lack the full validation of the original instrument.

Further Reading

For those interested in a deeper dive, the following references are recommended:

• Eysenck, H. J., &Eysenck, S. B. (1991). Manual of the Eysenck Personality QuestionnaireRevised. London: Hodder &Stoughton.
• Bagby, R. M., et al. (2005). The psychometric properties of the EPQR. Personality and Individual Differences, 39(6), 10671075.
• DeYoung, C. G., &Haslam, N. (2015). Higgins, Eysenck and the structure of personality. Psychology Review, 122(3), 453476.
• McCrae, R. R., &Costa, P. T. (2008). The fivefactor theory and personality measurement. Handbook of Personality Psychology.

Conclusion

The EPQR remains one of the most influential tools for measuring core personality dimensions with a solid theoretical foundation and robust psychometric evidence. While it is not without criticism, its brevity, ease of use, and extensive normative data make it a valuable instrument for both researchers and clinicians seeking to understand how personality influences behaviour, health, and life outcomes.