Knowra Hans Eysenck Hans Eysenck Hans Eysenck (1916–1997) was a German-born British psychologist whose work shaped trait theories of personality and intelligence. His claims about psychotherapy and racial differences in intelligence drew lasting scientific and ethical controversy.
Trait theory : An approach to personality that explains individual differences through relatively enduring characteristics. Eysenck treated personality as measurable dimensions rather than collections of isolated behaviors.
Arousal theory : A family of theories explaining behavior through levels of physiological activation and their regulation. Eysenck proposed that baseline cortical arousal helps explain introversion and extraversion.
Eysenck Personality Questionnaire : A self-report inventory measuring extraversion, neuroticism, and psychoticism in Eysenck’s personality model. This questionnaire translated his three-factor theory into a widely used assessment.
Hans Eysenck controversy : A set of disputes over the validity, ethics, and publication of research associated with Eysenck. Investigations into his work led journals and institutions to reassess numerous publications.
Big Five personality traits : A widely used model organizing personality variation into openness, conscientiousness, extraversion, agreeableness, and neuroticism. The five-factor framework overlaps with Eysenck’s dimensions but organizes personality differently.
Extraversion and introversion : A personality dimension contrasting outward social engagement with inward-focused reserve. Extraversion was one of Eysenck’s central dimensions and a foundation of his personality model.
Reticular activating system : A network of brainstem pathways involved in wakefulness, alertness, and cortical activation. Eysenck linked individual differences in arousal to this system’s role in alertness.
Maudsley Personality Inventory : A personality questionnaire developed by Eysenck to measure extraversion and neuroticism. It was an early instrument through which Eysenck operationalized his two-factor model.
Race and intelligence : A contested research and public debate about population categories and measured cognitive test performance. Eysenck’s claims about racial differences made this debate central to his public legacy.
Raymond Cattell : A British-American psychologist who developed a detailed factor-analytic theory of personality traits. Cattell’s many-factor system offered a competing approach to reducing personality descriptions.
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