Hans Eysenck
Temperament written in biology
A trait theorist who rooted personality in the workings of the nervous system.
techniques
Personality is determined to a large extent by a person's genes.
Who they were
Hans Eysenck argued that personality rests on a biological foundation, proposing a small set of broad dimensions such as extraversion and neuroticism tied to differences in arousal and temperament. He prized measurement and prediction, and was famously willing to provoke debate within his field. His dimensional model became one of the most influential and widely tested frameworks in the study of personality. It laid groundwork for later biologically grounded theories of who we are.
Famous books
What they left on the shelf
Terms they cared about
Ideas worth knowing
Their techniques
How the work was done
Their big idea
Biological Trait Theory
Hans Eysenck argued that personality rests on a few broad, measurable dimensions rooted in biology, with traits like extraversion tied to differences in how easily the nervous system is aroused. In his view, the quiet and the outgoing differ not by upbringing alone but by the baseline excitability they are born with.
Questions in their spirit
What they’d ask you
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Carry the idea forward
Eysenck — What they’d ask you
Psipas asks you one small, honest question at a time — and builds the picture from your answers.