As Hans Eysenck described in his 1956 book "Sense and Nonsense in Psychology", Eysenck compiled a list of political statements found in newspapers and political tracts and asked subjects to rate their agreement or disagreement with each.
Verjel je, da je nekaj podobnosti eksistencialno med nacionalsocialisti ali nacisti na eni strani in pa komunisti na drugi kljub nasprotnim stališčem na levo-desni osi.