 Carl Jung credited Gross with having described two general types – "inferiority with shallow consciousness" and "inferiority with contracted consciousness" – that very closely resemble what Jung described as the extraverted feeling and introverted thinking types a decade later.Despite having issues with Gross's theoretical assumptions of a secondary cell function and the "individual" nature of a person's passion, Jung credited Gross with major advances in typological and psychological theory.In his 1913 work "A Contribution to the Study of Psychological Types", Jung devoted a paragraph to Otto Gross's contributions.