Biological Bases of Psychoticism
Psychoticism is believed to be associated with levels of dopamine. Other biological correlates of psychoticism include low conditionability and low levels of monoamine oxidase; beta-hydroxylase, cortisol, norepinephrine in cerebrospinal fluid also appear relevant to psychoticism level.
Eysenck's theoretical basis for the model was the theory of Einheitspsychosen (unitary psychosis) of the nineteenth-century German psychiatrist Heinrich Neumann.
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